According to the atomic radius, the largest atom or ion in each grouping are – [tex]S^2^-[/tex], [tex]Mg[/tex] , [tex]Sb[/tex] , [tex]Ca[/tex] , [tex]Na[/tex] .
A measure of the size of an atom is the atomic radius of a chemical element, which is normally the average distance between the core of the nucleus and the outermost isolated electron. There are several non-equivalent descriptions of atomic radius since the border is not a clearly defined physical object.
Since the net nuclear charge steadily rises as a result of higher electron attraction to the nucleus, the radius of atoms decreases across a period. However, as the number of shells in each atom grows along the group, the atomic radius increases.
Neutral atoms typically become larger down a group and smaller across a period. The radius of a neutral atom increases or decreases as it acquires or releases an electron, becoming an anion or cation, respectively.
In the given groupings, the size of the atoms and ions according to the atomic radius is as follows:
[tex]S^2^- > S > Cl[/tex]
[tex]Mg > Al > Al^3^+[/tex]
[tex]Sb > Se^2^- > Se[/tex]
[tex]Ca > K^+ > Ca^2^+[/tex]
[tex]Na > Be > Be^2^+[/tex]
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You are holding two balloons of the same volume. One balloon contains 1. 0 g of helium. The other balloon contains neon. What is the mass of neon in the balloon?.
The mass of neon in the balloon is 5.045 grams.
m(He) = 1.0 g; mass of balloon with helium
M(He) = 4.0 g/mol; molar mass of helium
M(Ne) = 20.18 g/mol; molar mass of neon
m(Ne) = ?; mass of balloon with neon
If the balloons have the same volume, mass of the balloons depand on molar mass of gases.
m(He) / m(Ne) = M(He) / M(Ne)
1.0 g / m(Ne) = 4.0 g/mol / 20.18 g/mol
m(Ne) = 20.18 g / 4.0
m(Ne) = 5.045 g; mass of balloon with neon
Mass is a fundamental measure of the amount of matter in the object.
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16.8 g N205
Express your answer using three significant figures.
explain it with the steps, please help me!
Answer:
0.156 grams or 3.49 liters or 9.39E22 atoms
Explanation:
assuming you want moles:
16.8 / 108 = 0.156
assuming you want liters:
0.156 x 22.4 = 3.49
assuming you want atoms:
0.156 x 6.02E23 = 9.39E22
After extraction of the benzoic acid into the aqueous solution as its anionic salt, the ether solution was then washed with water two further times. What do you think was the purpose of these two wash steps?.
After extracting benzoic acid as its anionic salt into the aqueous solution, two more washes were carried out to get rid of any unreacted inorganic elements that were still present in the ether solution (due to the added separating reagent).
NaOH must be added to a mixture in order to extract benzoic acid; any additional NaOH must then be removed in order to proceed. Additionally, the solution is rinsed with water two or three times to remove any extra NaOH.
Washing is done to lessen the amount of residue and other pollutants in the layers. Because ether is non-polar and water is polar, polar contaminants, such as the residual anionic salt of benzoic acid, tend to migrate to the water during washing, giving you a purer organic layer.
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What is the net force and direction of the block?
Answer:
We know that the forces are added if they are in the same direction and they are subtracted if they are in opposite directions. So, the net force = 10 N (North) + 10 N (North) = 20 N (North) and 8 N (West) - 8 N (East) = 0. Therefore the net force on the block is 20 N in the North direction
How does an increase in the temperature of a chemical reaction affect the reaction rate? the reaction rate decreases. the reaction rate increases. the reaction rate does not change.
The reaction rate increases with increase in Temperature.
The average velocity of the particles increases as the temperature rises. These particles' average kinetic energy is likewise raised. As a result, because the particles move faster and encounter more reactant particles, they will collide more frequently. However, this is only a small portion of the rationale for the rate hike. Just because particles collide more frequently is not guarantee that the reaction will occur.
The main impact of increasing the temperature is that more of the particles that collide will have the necessary energy to collide effectively. In other words, more particles will have the activation energy required.
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What is the density of a substance with a mass of 45. 00 g and a volume of 26. 4 ml?.
1.70 g/mL is the density of a substance with a mass of 45. 00 g and a volume of 26. 4 ml.
What is density ?Mass per unit of volume is referred to as density. Although the Latin letter D can also be used, the symbol for density is most frequently written as (the lower case Greek letter rho). Mass divided by volume is the mathematical definition of density: where is the density, m is the mass, and V is the volume. Density is sometimes loosely defined as a substance's weight per unit volume, while this is incorrect scientifically; the term "specific weight" is more appropriate. An example of this is in the oil and gas business in the United States.
The density and mass concentration of a pure substance are numerically equivalent. Density can affect buoyancy, purity, and packing. Varied materials typically have different densities.
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Complete the following statement with a single word: percent error is a quantitative measure of the _________ of a measurement or result.
Complete the following statement with a single word: percent error is a quantitative measure of the inaccuracy of a measurement or result.
The percent error is an error between an observed value and the true value of a measurement.
Percent Error = (Actual Value - Estimated Value / Actual Value) × 100%
Accuracy is the closeness of a measurement to the true value. Accuracy is the basic of analytical chemistry.
There are three types of error in chemistry: gross errors, random errors and systematic errors.
Percent error indicates value of an error during the experiment.
Percent error shows how unavoidable errors affect the experimental results.
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Calculate the radius of a palladium atom in nano-meters, given that pd has an fcc crystal structure, a density of 12.0 g/cm3 , and an atomic weight of 106.4 g/mol.
The radius of pd atom will be 137.158 pm
Density of unit cell is given as 12.0 g/cm3
Molar Mass is 106.4 g/mol
We know that
The radius will be calculated by density formula since Pd crystallises in FCC structure , the number of cell per unit cell is 4 and the molar mass is given as 106.4g/mol so the edge length will be calculated as follows
Density= Z× M/ Na × a3
where,
Z= No of atoms per unt cell
M= Molar mass
Na= Avogadro's number
a= edge length
12.0= 4× 106.4/ 6.023× 10²³ × a3
a³= 425.6/ 6.023× 10²³ × 12
a³= 5.88×10-²³
a= 3.88× 10^-8
r= √2a/4
r= √2 × 388pm/4
r=137.158pm
r=0.137 nm
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The pd atom will have a radius of 137.158 pm. It is provided that Pd crystallizes in an FCC structure, the radius will be computed using the density formula, there are 4 cells per unit cell, and the molar mass is given as 106.4g/mol, the edge length will be determined as follows:
The unit cell's density is 12.0 g/cm3.
106.4 g/mol is the molar mass.
We know that ,
density = ZM/ Na× a³
where,
Z=Atoms in each unit cell
Molar mass
Avogadro's number is Na.
a = edge length
12.0= 4× 106.4/ 6.023× 10²³ × a³
a³= 425.6/ 6.023× 10²³ × 12
a³= 5.88×10⁻²³
a= 3.88× 10⁻⁸
r= √2a/4
r= √2 × 388pm/4
r=137.158pm
r=0.137 nm
So, the radius of the pd atom will be 0.137nm
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Discuss the molar equivalents of sodium borohydride. does this make sodium borohydride the limiting reagent? why or why not. (a couple sentences are sufficient).
The sodium borohydride is a limiting agent. 1 mole of sodium borohydride contains 4 mole of hydride.
What are limiting agent?A limiting agent is define as the reactant that get consumed first in a chemical reaction and therefore limits how much product can be formed.
2NaH + B2H6 -> 2NaBH4
According to the reaction 2 mole of NaH will give 2 mole of NaBH4. NaH is a limiting agent.
The borohydride will reduce to aldehyde or ketone involves the addition of two hydrogen atom.
RCHO -> RCH2OH in presence of BH4- and H+
We can write major steps as:
4RCHO + BH4- -> (RCH2O)4B-
This is one mole of BH4- and four mole of H+
Thus, the sodium borohydride is a limiting agent. 1 mole of sodium borohydride contains 4 mole of hydride.
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i have to do a presentation on my favorite element on the periodic table. which element is the easiest to use?
Answer: Oxygen or Nitrogen
Explanation:
We know the most about these elements because both of these elements are some of the most abundant on Earth.
The __________ lobe contains the area of the cortex involved in auditory processing called the primary __________ cortex. a. parietal . . . auditory b. temporal . . . motor c. occipital . . . motor d. temporal . . . auditory please select the best answer from the choices provided a b c d
The temporal lobe contains the area of the cortex involved in auditory processing called the primary auditory cortex.
what is the auditory cortex?
The part of the temporal lobe that processes auditory information in humans and many other mammals is called the auditory cortex. It is a component of the auditory system and performs both fundamental and advanced hearing processes, including those that may be related to language switching. In humans, it curves down and onto the medial surface, on the superior temporal plane, within the lateral sulcus, and includes portions of the transverse and superior temporal gyri, including the planum polare and planum temporale. It is situated bilaterally, roughly at the upper sides of the temporal lobes (roughly Brodmann areas 41 and 42, and partially 22).
The primary auditory cortex, a region of the cortex involved in auditory processing, is located in the temporal lobe.
Thus, the correct answer is d. temporal; auditory.
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Liquids with many free hydroxide ions (OH-) are called _________.
Answer:
hypothesis testing center of the year with 32 days
Calculate the molarity of a solution containing 61.3 grams of c2h6o in 3.4 l solution.
The molarity of a solution containing 61.3 grams of C₂H₆O in 3.4 l solution is 0.39M.
The molarity of a solution is the quantity of solute in moles per liter of solution. Molarity is represented by a capital M. A solution is a combination of two or more compounds in chemistry in which neither substance undergoes chemical change.
Molarity = given mass / molecular weight × volume of solution (in L)
Molarity = 61.3 / 46.07 × 3.4
Molarity = 61.3 / 156.63 = 0.39M
Therefore, the molarity of a solution containing 61.3 grams of C₂H₆O in 3.4 l solution is 0.39M.
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The pressure of a gas is 0.975 atm when its volume is 400 ml. calculate the pressure if the gas is allowed to expand to 600 ml at constant temperature.
The final pressure is 0.65 atm is allowed to expand the gas. Boyle's law, an experimental gas law, states that as a container's capacity rises, a gas's pressure tends to drop.
1) A current formulation of Boyle's law is:
If the temperature and amount of gas remain constant in a closed system, the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies.
2) Boyle's law can be expressed mathematically as follows:
P ∝ 1/V
or
PV = k
Acc to the Boyle's law ,
P1V1 = P2V2
The initial pressure = 0.975 atm
The initial volume = 400 ml
When the gas is allowed to expand ,
The final Volume = 600 ml
We need to find the Final pressure by using the above formulae and substitute the values in the formulae.
0.975× 400 = P2 ×600 ml
The final pressure = 0.975× 400/600
= 0.65 atm
The final pressure of the gas is 0.65 atm provided that the temperature is constant by using the Boyle's law.
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What is the molar concentration of sodium ion in a 200.0 ml solution prepared from 1.223 g of sodium phosphate (na3po4, 163.9 g/mol), which is a cleaning agent, food additive, and stain remover?
The molar concentration of sodium ion in a 200.0 ml solution prepared from 1.223 g of sodium phosphate (na3po4, 163.9 g/mol) is 0.0373 M
What is molar concentration?
The term "molar concentration" refers to the amount of a substance in a solution represented as a percentage of its volume. It is also used to refer to molarity, quantity concentration, or substance concentration.The number of moles per litre, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry. One mol/L of a solution's concentration is referred to as one molar, or 1 M.
Volume of given solution = 200 ml = 0.2 l
Molecular weight of sodium phosphate = 163.9g
Amount required to make the solution = 1.223g
Thus, no of moles of sodium phosphate = 1.223/163.9 moles = 7.46*10^(-3) moles
Thus molar concentration = molarity = 7.46*10^(-3) moles/0.2 = 0.0373 M
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How much heat must be absorbed by a 17.0 g sample of water to raise its temperature from 25.0 oc to 53.5 oc?
The heat absorbed by a 17.0g sample of water to raise its temperature from 25°C to 53.5°C is 2034.
The heat absorbed by the water is :
Q = mCΔT
here : Q = amount of heat absorbed ( in joules)
m = mass of the given sample ( in grams)
C = specific heat capacity of the given sample
[ for water, specific heat capacity is 4.2 [tex]\frac{J}{gC}[/tex]
ΔT = change in temperature ( final temperature - initial temperature)
calculation:
Q = 17 × 4.2 × ( 53.5 - 25.0 )
Q = 2034.9J
result :
The heat absorbed by the sample is 2034.9 J
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160 cm³ of ethyl alcohol has a mass of 126.4 grams. What is the density of this alcohol?
1.27 g/cm³
1.8 g/cm³
1.0 g/cm³
0.79 g/cm³
Answer: 1.27 g/cm3
Explanation:
160cm3/126.4 grams
A student obsevers a substance that is highly refletive and able to conduct electricty. The subtance also has a high meltiling point. Which is most likely classification for this subtance
The substance is classified as metal as it is highly reflective, conducts electricity and has a high melting point.
Elements with distinctive chemical and physical characteristics are referred to as metals.
A metal is a substance that has a shiny look when freshly processed, polished, or shattered, and conducts heat and electricity rather effectively. Generally speaking, metals are malleable, ductile, and opaque. These characteristics are the outcome of the metallic link that exists between the metal's atoms or molecules.
Metals make up around 75 percent of all chemical elements that are currently understood. Compared to other elements, metals are denser.
Ferrous metals, which include iron, and non-ferrous metals, which do not, are the two basic categories into which metals may be separated.
Metals are excellent building materials. Strength, hardness, and rigidity are just a few of the qualities that metals possess. Metals may be heated and formed into anything, from a little paperclip to an enormous airplane. They are important for electrics and frying pans since they are strong conductors of heat and electricity.
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body systems chart & functions can someone help me I will give brainlest
Answer:
System:
Integumentary System
Major structures:
epidermis, dermis, hypodermis, associated glands, hair, and nails.
Functions:body temperature regulation, cell fluid maintenance, synthesis of Vitamin D, and detection of stimuli.
Assciated diseases:
Acne. What is acne? ...
Alopecia Areata. What is alopecia areata? ...
Atopic Dermatitis. What is atopic dermatitis? ...
Epidermolysis Bullosa. What is epidermolysis bullosa? ...
Hidradenitis Suppurativa (HS) ...
Ichthyosis. ...
Pachyonychia Congenita. ...
Pemphigus.
System:
Muscular system:
Major structures:
skeletal, smooth, and cardiac muscle.
Functions:
Muscles, attached to bones or internal organs and blood vessels, are responsible for movement
Asscoiated dieseases:
Musculoskeletal Disorders. Muscle Strain. Tendinitis. Carpal Tunnel Syndrome.
Neuromuscular Disorders. Muscular Dystrophy. Myasthenia Gravis. Parkinson's Disease. Feature: Human Biology in the News.
System: Skeletal
Major structures:
hydrostatic skeleton, exoskeleton, and endoskeleton.
functions:
It gives the body its shape, allows movement, makes blood cells, provides protection for organs and stores minerals.
Associated diseases:
Osteoporosis. This common disease occurs when bones become weak due to changes in bone mineral density and mass, causing a higher risk for fractures. ...
Fracture. ...
Scoliosis. ...
Paget's disease. ...
Osteoarthritis. ...
Rheumatoid arthritis. ...
Gout. ...
Bursitis.
System:
Nervous System
Major structures:
he central nervous system is made up of the brain and spinal cord. The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.
Functions:
transmits signals between the brain and the rest of the body, including internal organs.
Associated diseases:
Infections, such as meningitis, encephalitis, polio, and epidural abscess
System:
Endocrine system
Major structures:
hypothalamus.
pituitary.
thyroid.
parathyroids.
adrenals.
pineal body.
the ovaries.
the testes.
Functions:
Makes hormones that control your moods, growth and development, metabolism, organs, and reproduction.
Associated diseases:
Acromegaly.
Adrenal Insufficiency & Addison's Disease.
Cushing's Syndrome.
Cystic Fibrosis link.
Graves' Disease.
Hashimoto's Disease.
System:
Circulatroy system
major structures:
the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic
Functions:
carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide.
Associated diseases:
Aneurysms. Aneurysms are weak spots in the walls of your arteries that can expand like a balloon. ...
Arrhythmias. ...
Blood pressure conditions. ...
Cardiomyopathy. ...
Congenital heart disease. ...
Heart failure. ...
Heart valve disease. ...
High cholesterol.
THERE FINALLY HOPE THIS HELPS :)))
Explanation:
How does a winnowing basket work
Answer:
The farmer places the wheat in the winnowing basket after flailing the grain. The threshing barn doors are opened on windy days. The farmer throws the grain into the air using the winnowing basket, where the wind removes the chaff.
Explanation:
Analyze the structure of 4‑sec‑butyl-5-ethyl-3-methyloctane. Identify the number of ethyl and methyl groups in the compound. Note that these groups are not necessarily confined to those specifically mentioned in the name.
One methyl group and one ethyl group.
What is a compound?
A compound can be obtained by a combination of atoms. We know that an organic compound would have a parent chain which is the longest straight chain of carbon atoms. There are normally side chains that could be attached to the longest chain.
We can see the compound that we are analyzing to be 4‑sec‑butyl-5-ethyl-3-methyloctane. The image of the compound is found in the image attached to this answer.
We can see that there is one methyl group and one ethyl group.
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Explain the effect that increasing the nacl concentration have on osmotic pressure.
Increasing the NaCl concentration will increase the osmotic pressure.
Osmotic pressure, alongside the vapor pressure depression, freezing point depression and the boiling point elevation are the colligative properties od solution.
The direction of osmotic pressure is always from the side with the lower concentration of solute to the side with the higher concentration.
π = c(NaCl) × T(NaCL) × R
π is osmotic pressure
c is concentration of solution.
T is temperature in Kelvins.
R is universal gas constant.
Greater the concentration of sodium chloride, the greater is the osmotic pressure, because the osmotic pressure and the concentratio are in direct proportion.
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Which would you expect to be the stronger nucleophile in a polar aprotic solvent?
In a polar aprotic solvent:
(a) [tex]CH_{3} O^{-}[/tex] is a better nucleophile than [tex]CH_{3} CO_{2} ^{-}[/tex]
(b) [tex]H_{2} O[/tex] is a better nucleophile than [tex]H_{2} S[/tex]
(c) [tex](CH_{3} )_{3} N[/tex] is a better nucleophile than [tex](CH_{3} )_{3} P[/tex].
The nucleophiles have more mobility in solution because polar aprotic solvents do not significantly hydrogen bind to them. In these circumstances, nucleophilicity and basicity have a strong correlation.
(a) The negative charge in [tex]CH_{3} CO_{2} ^{-}[/tex] is in resonance with carboxylic group so [tex]CH_{3} O^{-}[/tex] is a better nucleophile than [tex]CH_{3} CO_{2} ^{-}[/tex].
The strength of a nucleophile grows along the periodic table in polar protic liquids. On the other hand, the strength diminishes down the periodic table in polar aprotic solvents.
(b) Sulphur atom is placed below Oxygen atom in periodic table as elements are placed on the basis of their atomic number in the periodic table so [tex]H_{2} O[/tex] is a better nucleophile than [tex]H_{2} S[/tex].
(c) Phosphorus atom is placed below Nitrogen atom in periodic table as elements are placed on the basis of their atomic number in the periodic table so [tex](CH_{3} )_{3} N[/tex] is a better nucleophile than [tex](CH_{3} )_{3} P[/tex].
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Atoms of which two elements have a combined total of 16 protons?
Atoms of sulfur two elements have a combined total of 16 proton.
Briefing :A chemical element is sulfur. Each sulfur atom has 16 protons in its nucleus, as indicated by its atomic number of 16 and official symbol, S. The number of protons, positively charged nuclear particles, is represented by the atomic number Z. But Z determines an element's identity. If Z=1, the element is hydrogen; if Z=2, the element is helium; and if Z=16, the element is neon.
What is the element sulfur used for?In addition to being a fungicide and an ingredient in black gunpowder, sulfur is used to vulcanize black rubber. However, the majority of sulfur is utilized in the creation of sulfuric acid, which is arguably the most significant chemical produced by western civilisations.
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92. Round the answer for each problem to the correct
number of significant figures.
a. (7.31 × 104) + (3.23 × 10³)
b. (8.54 x 10-3) - (3.41 x 10-4)
c. 4.35 dm x 2.34 dm x 7.35 dm
d. 4.78 cm + 3.218 cm + 5.82 cm
e. 38,736 km + 4784 km
The correct significant figures are;
a. (7.31 × 10⁴) + (3.23 × 10³) = 7.633 x 10⁴
b. (8.54 x 10⁻³) - (3.41 x 10⁻⁴) = 8.199 x 10⁻³
c. 4.35 dm x 2.34 dm x 7.35 dm = 74.81565 dm³
d. 4.78 cm + 3.218 cm + 5.82 cm = 13.818 cm
e. 38,736 km + 4784 km = 43,520 km
What is significant figures?Significant figures are used to establish the number which is presented in the form of digits.
Solution of the given problems in correct significant figures;
a. (7.31 × 10⁴) + (3.23 × 10³) = 76,330 = 7.633 x 10⁴
b. (8.54 x 10⁻³) - (3.41 x 10⁻⁴) = 8.199 x 10⁻³
c. 4.35 dm x 2.34 dm x 7.35 dm = 74.81565 dm³
d. 4.78 cm + 3.218 cm + 5.82 cm = 13.818 cm
e. 38,736 km + 4784 km = 43,520 km
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How many water molecules in 25.3 g of solid ice (report in moles)(the density of water here is 0.920 g/cm3and the molar mass is 18.0 g/mol)?
moles of solid ice is = mass/ molar mass
M= 25.3/18
M = 1.405
no of molecules is = moles ×6.022×[tex]10^{23}[/tex]
= 1.405 × 6.022×[tex]10^{23}[/tex]
= 8.464×[tex]10^{23}[/tex] molecules.
What are molecules?The term "molecule" refers to a collection of two or more atoms bound together by the attractive forces known as chemical bonds . Molecular is frequently used to refer to polyatomic ions in quantum physics, organic chemistry, and biochemistry, where the distinction from ions is eliminated.
In general, molecules are not thought of as being made up of a single molecule when atoms and complexes are joined by non-covalent interactions like hydrogen bonds or ionic bonds.
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Which is the correct order of orbital filling according to the aufbau principle?a 4s 4p 4d 4f b 4p 4d 5s 4f c 4s 3d 4p 5s d 4d 4f 5s 5p
The correct order of orbital filling according to Aufbau principle is
(a) 4s 4p 4d
According to the Aufbau principle, electrons must occupy all of an atom's accessible orbitals, working their way up from the lowest energy level to the highest, to ensure that both the electrons and the atom have the least amount of energy possible and are stable.
As a result, electrons begin to occupy orbits in increasing order of "n" value, starting with the first orbit (n = 1).
If any orbital's primary quantum number is "n,"
n2 is the number of orbitals, and 2n2 is the number of electrons in any n-shell.
The orbital's's' sub-orbital count is 1′. P is three, while D is five.
There can be a total of two electrons in each orbital 0f an atom
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The correct order to fill the orbitals according to the Aufbau's principle is:
(a) 4s 4p 4d
According to the Aufbau principle, electrons occupy all accessible orbitals of an atom, rising from the lowest energy level to the highest energy level so that both the electron and the atom are at the lowest possible energy and are stable you need to make sure that
As a result, electrons start occupying orbitals in order of increasing "n" value, starting with the first orbital (n=1).
If the first quantum number of the orbital is "n",
n2 is the number of orbitals and 2n2 is the number of electrons in each n shell.
The number of s orbitals in the orbital is 1'. P is 3 and D is 5. There can be a total of two electrons in each orbital of an atom.
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A website will be most accessible if all of its content can be accessed with:
A. a mouse.
B. no headers.
C.a tab key.
D..a touch screen.
Answer:a mouse
Explanation:
Answer: a mouse
Explanation:
A compound consists of three times as many moles of chlorine as unknown metal m. Metal m contains 23 electrons and 31 neutrons when it forms this compound. What is the mass number of m?.
The mass number of metal M is 57.
Molecular formula of a compound is MCl₃, because chlorine has oxidation number -1 and metal +3.
Chlorine atom has atomic number 17 (17 protons and 17 electrons). When it gains one electron, it becomes chlorine anion Cl⁻ (negative charge), with 17 protons (positive electric charge of +1e elementary charge) and 18 electrons (negative one elementary charge).
Electron configuration of chlorine atom: ₁₇Cl 1s² 2s² 2p⁶ 3s² 3p⁵.
As a cation, metal has 23 electrons, and as an atom three electrons more 26. It has 26 protons.
The mass number (A) is sum of the number of protons and the number of neutrons in atom.
N(n°) = 31; number of neutrons in metal atom
N(p⁺) = 26; number of protons in metal atom.
A = N(n°) + N(p⁺)
A = 31 + 26
A = 57; the mass number of metal
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a microwave has a length of 20mm what is its frequency
As stated in the preceding statement 20 mm microwaves operate at a frequency of 15 GHz.
How is frequency determined?There are several ways to quantify frequency, including Counting: The number of times a recurring event occurs within a given time period is counted, and the number is then divided by the duration of the time period to determine the frequency of the occurrence.
Briefing:λ= 20 mm = 20×10⁻³ m
v=3 x 10⁸ m /s (In a vacuum, all electromagnetic waves move at the speed of light, which is 3 x 10⁸ m /s.)
3 x 10⁸ m /s= f × 20×10⁻³ m
3 x 10⁸ m /s÷20×10⁻³ m= f
1.5×10¹⁰ Hz= 15×10⁹ Hz= 15 GHz
20 mm microwaves have a 15 GHz frequency.
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