What are valence electrons
Answers
Answer:
Valence electrons are electrons located in the outermost energy level (Responsible for bonding.)
Explanation:
Hope this helps :)
Related Questions
Suppose that you run a reaction in ethanol to form a very non-polar organic substance. how would you extract your product?
Answers
To extract a very non-polar organic substance from a reaction that is run in ethanol, one possible method would be to use a liquid-liquid extraction technique.
This involves separating the non-polar product from the polar ethanol solvent by using a non-polar solvent that is immiscible with ethanol. One common non-polar solvent that can be used for this purpose is hexane. Hexane is immiscible with ethanol and is a good solvent for non-polar compounds. To extract the product, the reaction mixture is first cooled to separate any solid that may have formed. Then, the reaction mixture is added to a separatory funnel and the hexane is slowly added to the top of the funnel.
The two layers will separate and the hexane containing the non-polar product can be drained off the bottom of the funnel. The hexane layer is then washed with a small amount of aqueous solution (such as water or an aqueous solution of an acid or a base) to remove any remaining polar impurities and then dried over anhydrous salt (such as Na2SO4 or MgSO4) to remove any traces of water. After this process, the hexane can be evaporated to obtain the purified non-polar product.
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A 298-N force acts on a 200-g object. The acceleration of the object is?
Answers
298=0.2a
a=1490m/s^2
m=mass in kg
a=acceleration
Fnet= net force
200g÷1000
0.2kg
explain the process that creates chemical elements lighter than iron, including evidence
Answers
The process that creates chemical elements lighter than iron is known as nuclear fusion and the evidence is the fusion of carbon and helium nuclei which forms an oxygen nucleus, and so on.
What is Nuclear fusion?This is referred to as the type of reaction which is characterized by two or more atomic nuclei being combined to form one or more different atomic nuclei and subatomic particles.
It is also responsible for the creation of chemical elements lighter than iron through successive reactions and a common example is the fusion of carbon and helium nuclei to form an oxygen nucleus thereby making it the correct choice.
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predicting products of chemical reactions worksheet
Answers
Predicting the products of chemical reactions involves understanding the reactants and the type of chemical reaction taking place.
What are those reactions?
Understanding the reactants and the type of chemical reaction occurring is necessary to predict the results of chemical reactions. Synthesis, decomposition, single replacement, double replacement, and combustion are examples of common reaction types.One can apply the relevant chemical equation to anticipate the results by looking at the reactants and determining the kind of reaction that is occurring.For instance, two or more reactants unite to create a single product in a synthesis reaction. A single reactant disintegrates into several products in a decomposition process. Predicting the results of a chemical reaction requires practice and knowledge of the chemical characteristics of the components involved as well as the reactivity of the reactants.To learn more about chemical reactions refer to:
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Why the small community of Mount Laguna, California, just 55 miles from San Diego much colder than San Diego ?
Answers
Answer: It all boils down to the two cities' proximity to the Pacific Ocean, along with wind currents and geographical location
Explanation: It is known throughout the whole scientific community that a body of water near a city produces very stable temperatures throughout the year with small dips. When it is summer, instead of San Diego boiling in the heat, the Pacific absorbs most of this heat, making the heat in the city tolerable (almost), this makes the ocean appear cold in the summer.
When it turns to winter, the heat absorbed by the ocean in the summer gets radiated making the cold in San Diego negligible. Applying this same logic to Mount Laguna, which is not near a body of water, it can be understood that it would have more extreme temp. swings.
Along with water, there is wind currents. I don't live in Mount Laguna, but I have to assume from the context you gave me that a cold wind current usually flows there, making it colder than in San Diego, which has a warm current.
The location also matters, if this town is under a valley, canyon, or mountain it could be under a shadow further decreasing the temp. more than San Diego.
Hopefully this helps, and good luck!
What is the limiting reagent when 16 grams of ch4 is reacted with 64 grams of o2? what remains after the reaction?.
Answers
From the given reaction, Oxygen serves as the limiting reagent. Methane remains after the reaction.
What is a limiting reagent?A reactant that is completely consumed at the end of a chemical reaction is known as the limiting reagent. Since the reaction cannot proceed without this reagent, the amount of product that can be produced is constrained.
Because its quantity restricts the number of products that can be generated, the reagent that is totally consumed or reacted is known as the limiting reagent.
CO₂ + 2H₂O ⇒ CH₄+ 2O₂
One mole of methane will totally react with two moles of oxygen to produce one mole of CO₂ and two moles of water, according to the stoichiometric equation given above.
64g of oxygen and 16g of methane will totally react in such case.
When methane is burned, the weight ratio of the reactions between CH₄ and O₂ is (16:64)=1:4.
Only 32 g of oxygen are provided in the question, though. Since we only have 32 when 64 is divided, oxygen will be the limiting reagent in this scenario.
Oxygen serves as the limiting reagent.
Methane is the extra reagent.
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A sealable bag holds 3.79 L of
gas. How many moles of H2
gas are needed to fill the bag
at 1.0 atm and 293 K?
Answers
A sealable bag holds 3.79 L of gas. To fill the bag, 0.157 moles of H2 gas are required.
Calculating the moles:The ideal gas equation is what we use to solve this problem. Additionally known as the general gas equation. This equation is used to describe a possible ideal gas. It has a few restrictions. In 1834, Benoit Paul Emile Clapeyron made the first mention of it. An empirical form is used to write the ideal gas law:
PV = n R T
where-
P = Pressure
V = volume
T = Temperature
n = The amount of substance
R = Ideal gas constant
Now we have the values of these terms as-
P = 1 atm , V = 3.79L , T = 293 K
and R = 0.0826 L/atm
For getting moles of hydrogen we can use the values of variables in ideal gas equation as -
P V = n R T
Now (1 atm) × ( 3.79L ) = n × ( 0.0826 L/atm) × ( 293K)
n = (1 × 3.79) ÷ (0.0826 x 293)
= 0.157 moles
So that the 0.157moles of H₂ gas are needed for fill the bag .
Why is it referred to as ideal gas?A hypothetical gas made up of molecules that adhere to a few rules is referred to as the ideal gas. The molecules of ideal gas do not attract or repel one another. An elastic collision with the container's walls or an elastic collision with the ideal gas molecules would be the only interaction between them.
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Determine where each type of cleaning solution should be discarded after use.Water used to rinse detergent out of a flask _____ sink or waste containerSolvet used to rinse chemicals out of a beaker_____ sink or waste containerAcid solution used to clean a crucible___________ sink or waste container
Answers
Water used for washing purposes can be discarded into the sink as it does not affect the water pollution.
But in the case of organic solvent and acid solution they can be discarded into waste containers for proper disposal.
As we know that organic solvent and acid solution are hazardous for aquatic life. Their discopsal is a major concern.
What is water?
Water, a substance composed of the chemical elements hydrogen and oxygen and existing in gaseous, liquid and solid states. It is one of the most abundant and basic compounds. At room temperature, the tasteless and odorless liquid has an important ability to dissolve many other substances.To know more about water, click the link given below:
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A sealed container can hold
6.28 L CO2 at 1.00 atm and 293 K.
How many moles of CO2 fill the
container?
Answers
Approximately 0.26 moles of CO2 fill the container.
To determine the number of moles of CO2 that fill the container, we can use the ideal gas law equation:
PV = nRT
Where:
P = pressure of the gas (1.00 atm)
V = volume of the gas (6.28 L)
n = number of moles of gas (unknown)
R = ideal gas constant (0.0821 L·atm/mol·K)
T = temperature of the gas in Kelvin (293 K)
Rearranging the equation, we have:
n = PV / RT
Substituting the given values:
n = (1.00 atm) * (6.28 L) / (0.0821 L·atm/mol·K) * (293 K)
Calculating the expression:
n = 6.28 / 24.0513
n ≈ 0.26 moles
Therefore, approximately 0.26 moles of CO2 fill the container.
It's worth noting that the answer is rounded to two decimal places, as the given values were provided with two decimal places. Additionally, the calculation assumes ideal gas behavior and that there are no other gases or impurities present in the container.
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How many atoms are present in 2. 0 moles?.
Answers
Answer:
1.2004 x [tex]10^{24}[/tex]
Explanation:
One mole of any substance has 6.022 x [tex]10^{23}[/tex] atoms.
Setting up ratio between moles and atoms:
Moles : Atoms
1 : 6.022 x [tex]10^{23}[/tex]
2 : X
X = 2 x ( 6.022 x [tex]10^{23}[/tex] )
X = 1.2004 x [tex]10^{24}[/tex]
which of these minerals would be the main component in the cement slab in your house?
Answers
The main component in a cement slab in a house is typically Portland cement.
Key points:
Portland cement is a type of hydraulic cement that is commonly used in the construction of buildings, bridges, roads, and other structures.It is made by heating a mixture of limestone and clay to high temperatures, a process known as calcination.The resulting material is ground into a fine powder, which can be mixed with water, sand, and gravel to form concrete.The concrete is then poured and leveled to form the slab.The cement reacts with water to form a paste that binds the other materials together, creating a strong and durable building material.Portland cement is also used in other types of construction, such as in the production of mortar and stucco.Other types of cement such as blended cement can be used too, depending on the requirement and the availability of the raw materials.Learn more about cement slabs here:
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Why i carbon an element and not a compound?
All carbon atom have the ame number of proton. Carbon bond eaily with oxygen, but not helium. Carbon i found in all living organim. All carbon atom have the ame number of electron
Answers
Carbon is an element and not a compound because a) all carbon atom have the same number of protons.
Carbon is an element and not a compound because all of its atoms have the same number of protons.
This unique characteristic sets it apart from compounds, which are made up of two or more different types of atoms.
Carbon's atomic structure is composed of a nucleus surrounded by electrons and protons.
The nucleus is made up of protons and neutrons, and the protons determine the element's identity. Because all carbon atoms have six protons, they are all the same element.
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the smallest subatomic particle that makes up an atom, and carries a negative charge
Answers
Electrons are subatomic particles that are found in the energy levels swirling around the nucleus on an electron cloud and are negatively charged.
What is meant by nucleus ?
In terms of genomics, a nucleus is the organelle within a cell that is membrane-enclosed and houses the chromosomes.The nuclear membrane contains a variety of pores that allow specific chemicals to enter and exit the nucleus in different ways.The nucleus' principal jobs include storing the cell's DNA, preserving its integrity, and assisting with transcription and replication.DNA is organized into chromosomes in the nucleus, which is located in the center of the cell.It is referred to as the cell's controller because it oversees all of the cell's operations. Nuclear membrane, nucleoplasm, and nucleolus are the three primary components of the nucleus.To learn more about nucleus refer to
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The manufacturer of
a new convection oven claims that his product
will bake things 25 percent faster than a con-
ventional oven that relies mainly on radiation.
How could you test this claim?
Answers
According to studies, convection ovens generally cook 25% faster than traditional ovens at a lower cooking temperature of roughly 25 degrees F, even if cooking times vary slightly between ovens.
Convection ovens, in contrast to conventional radiant (also known as thermal) ovens, include a fan that evenly distributes air inside the chamber, removing hot and cold regions.
A convection oven may cook food up to 25% more quickly than a regular oven.
Food cooks roughly 25% more quickly in a convection oven because hot air is blown directly onto it rather than merely surrounding it.
Convection ovens heat up more quickly and cook food more quickly. Thanks to some straightforward modifications to the appliance, they also cook more evenly.
All of this results in tastier baked goods, meats, and other foods.
Overall, the convection oven option is excellent if you want a crisp, rapid result, but stick with the regular oven if you want your food to retain moisture or rise before it is fully baked.
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Gases behave most ideally at ____________ temperatures and ___________ pressures.
Answers
Low pressures and high temperatures are the optimal conditions for gas behaviour. The ideal gas law [tex]PV = nRT[/tex] states that ideal gases must conform to this law.
It is only feasible if the gas is made up of several freely moving point particles that do not interact with each other and have a very small total volume. An ideal gas is one in which all collisions between atoms or molecules are completely elastic and in which there are no intermolecular attraction forces. It can be compared to a collection of perfectly hard spheres that collide but do not interact with one another in any other way. The molecules of perfect gases are not attracted to one another or repel one another.
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When a student squeezes a balloon, it changes shape. In which state of matter is the substance inside the balloon?
A. It could be either a liquid or a gas, because these states can change shape.
B. It could only be a liquid, because only liquids can change shape
C. It could only be a gas, because only gases can change shape.
D. It could not be a liquid or a solid, because neither of these states can change shape.
Answers
If you think about it, you have two balloons, a helium filled ballon and a water balloon. When you squeeze them, they will change shape. So yes liquid and gas changes. So you can cross out B and C. Now let’s look at D. D says it could not be a liquid or solid because neither can change. Well we just said liquid can change. But half of D is correct, solid cannot change shape. Think about a frozen water balloon. It’s ice instead of water on the inside. (I’m not sure if it’s even possible to have a frozen water balloon.) if you squeeze that ice balloon, it won’t change.
True or False: If you have two different isotopes, like Chlorine-35 and Chlorine-37, they have the same number of neutrons
True
False
Answers
Answer:
I believe the answer is True
Explanation:
I could be wrong but in order for Chlorine 35 and Chlorine 37 to be different would they have to have a different amount of electrons? I am sorry if this is wrong. I took Chemistry a few years ago.
Answer:
The number after the name 'chlorine' is called the mass number. The mass number is a tally of the number of protons and the number of neutrons in an atom's nucleus. Since all atoms of chlorine contain 17 protons, chlorine-35 and chlorine-37 differ in the number of neutrons each one has.
Explanation:
So its true lol
:)
Atoms to grams. How many grams of KNO3 are in
2.98 x 10 22 atoms of KNO3?
Answers
Answer:
4.949 g
Explanation:
One mole of any substance has 6.022 x [tex]10^{23}[/tex] atoms or particles.
Setting up ratio between moles and atoms:
Moles : Atoms
1 : 6.022 x [tex]10^{23}[/tex]
X : 2.98 x [tex]10^{22}[/tex]
X = (2.98 x [tex]10^{22}[/tex])/(6.022 x [tex]10^{23}[/tex])
X = 0.049 moles
The molar mass of KNO3 is : 39 + 14 + ( 16 x 3 ) = 101 g/mol
Moles : Mass
1 : 101
0.049 : X
X = 0.049 x 101
X = 4.949 g
A block of wood measures 3.00 cm x 2.00 cm x 5.00 cm and has a mass of 22.5 grams what is it ?
Answers
Determine quantitative density of a liquid whose mass is 62 g and whose volume is 31 mL. A block or wood with the dimensions 3 cm x 2 cm x 5 cm and a heft of 22.5 g (2 g/mL)
How do you calculate a block of wood's volume?
Result for an image A timber block weighs 22.5 grammes and has dimensions of 3 cm x 2 cm x 5 cm. What is that?
It is simple to determine the volume of such a block, prism, a cylinder by multiplying the base's area by the object's height or altitude.
How is block mass determined?
Multiply the volume and density together.
You may get the mass of your object by multiplying your two numbers together. You'll notice that you end up having units of mass if you keep track of both the units as you go along (kilograms or grams). A diamond, for instance, has a volume of 5,000 cm3 and a density of 3.52 g/cm3.
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Determine quantitative density of a liquid whose mass is 62 g and whose volume is 31 mL. A block or wood with the dimensions 3 cm x 2 cm x 5 cm and a heft of 22.5 g (2 g/mL)
How do you calculate a block of wood's volume?Result for an image A timber block weighs 22.5 grammes and has dimensions of 3 cm x 2 cm x 5 cm. What is that?
It is simple to determine the volume of such a block, prism, a cylinder by multiplying the base's area by the object's height or altitude.
How is block mass determined?Multiply the volume and density together.
You may get the mass of your object by multiplying your two numbers together. You'll notice that you end up having units of mass if you keep track of both the units as you go along (kilograms or grams). A diamond, for instance, has a volume of 5,000 cm3 and a density of 3.52 g/cm3.
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Question- Convert 8.65 × 10^25 atoms H to its mass in grams
A. 5.26 x 10^49 g H
B. 1.45 g H
C. 1.01 g H
D. 145 g H
Answers
Answer:
Mass = 145g H
Explanation:
-First we need to convert atoms to moles :
1mole =6.022 ×10^23 atoms (The number of particles in 1 mole is called Avogadro's Number (6.0221421 x 1023))
8.65×10^23 atoms of H ×1 mol / 6.022×10^23
=1.45×10^2
=145 mol
- then convert moles to grams :
Mass in grams of H
Mass = number of moles ×molar mass for H
= 145 mol ×1 g/mol
= 145 g
What did I do wrong and how would I do this correctly?
Answers
The mass of the hydrogen gas produced is equal to 0.368 g, not 0.322 this is wrong mass .
The reaction between calcium and water yields the following balanced chemical equation: 2 Ca + 2 H₂O → 2 CaOH + H₂
Given :that the mass of calcium is 14.7 g,
the number of moles of calcium is 14.7/40, which equals 0.3675 mol.
The number of moles of water is 11.5/18, which equals 0.638 mol.
Two moles of calcium react with two moles of water.
Calcium is therefore a limiting reagent.
What is the chemical equation?The mass of 0.1838 mol of hydrogen gas is 0.368 g, and 0.3675 mol of Ca produces hydrogen gas. A balanced chemical equation is one in which both sides of the equation have the same number of atoms.
In chemistry, what is a limiting reagent?The reactant that is consumed first in a chemical reaction, also known as the limiting reagent, limits the amount of product that can be produced.
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which size of micropipette would you select to deliver 215 microliters?
Answers
A micropipette of size P1000 (can read upto 1ml) would be required or selected to deliver or transfer 215 microliters of liquid.
A micropipette is an instrument used to transfer small amounts (<= 1 ml) of liquids. The scales on a micropipette are in microliters (1000µl = 1 ml). These are very delicate and expensive instruments costing between $150-300 a piece. These instruments come in three sizes which are capable of pipetting three ranges of volumes:
P20 type can transfer liquids between the range of 5- 20 µl,
P200 type can transfer liquids between the range of 20-200 µl, and
P1000 type can transfer liquids between the range of 200-1000 µl.
These instruments are used in conjunction/simultaneously with disposable and often sterile plastic tips.
A fixed volume micropipette is a pre-set instrument to measure only a specific volume. Although the volume transferred/delivered by a given pipet cannot be changed, this pipet is operated analogously to the variable micropipette. A fixed volume micropipette often does not have a tip ejector button, so the tips are to be removed manually while the required steps of the process.
It is of utmost importance to use the correct pipettor available for the volume that is to be dispensed. As going below or above the range provided for a micropipette, may damage the instrument.
Thus, a micropipette of type P1000 only should be used to deliver any liquid of volume 215 microliters.
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What are the hottest areas of the Sun?
Answers
What happens to pressure when.. *read image*
Answers
Answer:
Explanation:
the answer is B.
It is required to make 8 grams of certain chemical compound called z. This is made from compounds w, x, and y in the ratio of 2:1:3. The compound y is itself made from w and x. To make 6 grams of y requires 4 grams of w and 2 grams of x. How much w and x is required to make the required amount of z.
Answers
From the given data of chemical compounds, 5.32 grams of W and 2.66 grams of X are needed.
The following calculation must be done to determine how much W and X is needed to make the necessary amount of Z because it takes 8 grammes of a chemical compound called Z to make it, and Z is made from compounds W, X, and Y in the ratios of 2: 1: 3 and Y is itself made from W and X, and to make 6 grams of Y requires 4 grams of W and 2 grammes of X.
8/6 = 1.33
The resulting ratio is 2.66 : 2.33 :3:99.
3.99 = w
3.99 x 4/6 = 2.66
1.33 grams of X are equal to 2.66 grams of W.
2.66 x 2 = 5.32
1.33 x 2 = 2.66
5.32 grams of W and 2.66 grams of X are therefore needed.
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dilute hydrochloric acid Hinc N K a) Name each of the parts labelled J, K,L,M,N and P b) State the function of each of the parts labelled L and P c) State the method of collection of the gas produced d) Describe how the gas produced could be tested for e) Write a balanced chemical equation for the reaction the gas preparation
Answers
Add dilute hydrochloric acid to calcium carbonate, bubbles of carbon dioxide gas appear.
Give an explanation of the process for making carbon dioxide gas from diluted hydrochloric acid.These are the steps in this procedure:
a) The component marked J is a heatproof mat that acts as a stable, heat-resistant basis to stop the test tube from shattering as a result of the heat produced.
A test tube is the item with the label K.
This is utilized to keep the reactants in check. The L-shaped component is a delivery tube.
through which the gas produced is piped into the delivery tube.
The M-designated component is a bung.
It serves to keep the generated gas inside the test tube.
Diluted hydrochloric acid, which is the component with the letter N, serves as the reactant that creates the gas.
A delivery tube is the component with the letter P.
It is employed to gather the gas generated.
b) The L-shaped component's job is to route the created gas into the delivery tube.
The P-shaped component's job is to collect the created gas.
c) Downward delivery is the mechanism used to collect the created gas.
This is accomplished by joining the delivery tube to the test tube and submerging the delivery tube's tip in a water beaker.
This enables the generated gas to pass through the delivery tube and into the water-filled beaker.
d) A burning candle or a glowing splinter can be used to detect the gas created.
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Question- Convert the 3.40 x 1022 formula units of table salt, NaCl, to its mass in grams.
Answers:
A. 0.0565 g NaCl
B. 58.4 g NaCl
C. 3.30 g NaCl
D. 6.02 g NaCl
Answers
To solve this we must be knowing each and every concept related to mole. Therefore, the correct option is option C among all the given options.
What is mole?A mole is merely a measuring unit. In reality, it is one of International System of Units' seven foundation units (SI). When basically determines are insufficient, new units are created.
Chemical reactions frequently occur at levels that use grams would be inappropriate, but using actual figures of atoms/molecules/ions would also be misleading.
It's much easier to write' mole' than '6.02x10²³' whenever you wish to refer to a huge number of things. That is essentially why and how this particular component was created.
number of mole =given number of atoms ÷ 6.022×10²³(Avogadro number)
number of atoms = 3.40 x 10²² atoms
number of mole=3.40 x 10²² ÷ 6.022×10²³
=0.056moles
mass of NaCl=0.056moles ×58.44
=3.27g
Therefore, the correct option is option C among all the given options.
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A general formula for a double-displacement reaction is written as:
Answers
General formula of double displacement reaction is:
AB + CD = AD + BC where AB and CD are the displaced reactants.
A double displacement reaction occurs when two reactants exchange ions to form two new compounds. Double displacement reactions usually result in the formation of a precipitate as a product.
Precipitate is typically formed as a result of a double displacement reaction.
The two types of bonds that exist between the reactants can be covalent on ionic in nature.
The other name for a double displacement reaction is salt metathesis reaction. It is an exchange reaction, or we can say a double decomposition reaction when one or more of the reactants does not dissolve in the solvent.
The simplest way to identify a double displacement reaction is to see if the cations exchanged anions with each other. If the states of matter are mentioned, look for aqueous reactants and the formation of a single solid product.
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A neutron is a subatomic particle found in the nucleus of every atom except that of simple hydrogen. The particle derives its name from the fact that it has no electrical charge; it is neutral. Its relative mass is 1u and absolute mass is 1.6×10−24g.
Answers
A neutron is a subatomic particle found in the nucleus of every atom except that of simple hydrogen. The particle derives its name from the fact that it has no electrical charge; it is neutral. Neutrons are extremely dense.
What is meant by neutron ?
Every atom's nucleus has a neutron, with the exception of plain hydrogen, which does not.The fact that the particle has no electrical charge it is neutral gives it its name. Neutrons have a very high density.Compared to positively charged protons, neutrons have a little higher mass and a neutral electric charge. Neutrons that have left a nucleus are considered to be "free" neutrons.A subatomic particle having a positive charge is called a proton.The strong nuclear force holds protons together in the nucleus of an atom. A particular subatomic particle with no charge is the neutron.Given that it is a composite particle consisting of quarks, the neutron is categorized as a hadron.To learn more about neutron refer to
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which product besides radiation do radioactive atoms give off when they decay?
Answers
When radioactive atoms decay, they give off alpha particles, beta particles, and gamma rays in addition to radiation.
Alpha particles are made up of two protons and two neutrons, making them similar to a helium nucleus. They have a positive charge and are relatively large and slow-moving. Beta particles are high-energy electrons or positrons, and are much smaller and faster than alpha particles. They have a negative charge. Gamma rays are high-energy electromagnetic radiation, similar to X-rays. They have no mass and no charge and are the most energetic and penetrating of the three types of particles. These particles are emitted during the radioactive decay process, and the type and amount of particles emitted depends on the specific isotope undergoing decay.
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