The size of micropipette that you would select to deliver 215 microliters would be a micropipette with a volume range of 200-1000 microliters.
What is a micropipette?
A micropipette is a laboratory instrument used to measure and dispense small volumes of liquid, typically in the range of microliters (µL) or nanoliters (nL). They are commonly used in chemistry, biology, and biochemistry experiments, as well as in clinical and industrial settings.
Micropipettes consist of a handle, a digital or manual volume adjustment mechanism, and a tip that is placed into the liquid to be dispensed. They work by creating a vacuum or positive pressure inside the tip, which draws or pushes the liquid out of the tip.
Micropipettes come in different volume ranges and it is important to select the right one to ensure accurate delivery of the desired volume. For example, a micropipette with a volume range of 2-10 microliters would not be suitable for delivering 215 microliters, while a micropipette with a volume range of 200-1000 microliters would be more appropriate.
It's also important to note that, even if the micropipette is able to deliver 215 microliters, you should always check the calibration of the micropipette before use, to make sure that it's delivering the correct volume.
Hence, a micropipette with a volume range of 200-1000 microliters is suitable to deliver 215 microliters.
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Which relationship is true of an uncharged atom? the number of protons is equal to the number of electrons.
The relationship that the number of protons is equal to the number of electrons is true for an uncharged atom of an element.
Electrons are negatively charged particles with a negligible mass. These negatively charged particles revolve around the nucleus in discrete orbits called shells.
Protons are positively charged particles which have a mass of approximately 1 amu (atomic mass unit). These positively charged particles are present in the center of the atom, inside the nucleus.
When an atom has an equal number of negative (the electrons) and positive (the protons) electric charges, it is called an uncharged atom. As a result of which, the atom's total electric charge is NIL (zero), and hence it is said to be neutral. For example, a carbon atom includes six protons and six electrons, so it's an uncharged carbon atom with an atomic number of 6.
Therefore, all the elements in the periodic table are atoms in their neutral form.
Thus examples of uncharged atoms would be all neutral atoms, such as Nitrogen atom, Oxygen atom, Hydrogen atom, Sulphur atom, Potassium atom, etc.
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Scientists want to investigate the effects caffeine on short term memory by randomly assigning 200 volunteers to intake 86mg of caffeine before a memory quiz and the remaining 200 volunteers to intake 86mg of a placebo before taking a memory quiz. The quiz score of each volunteer is recorded.
What is the response variable?
The response variable in this study is the memory quiz score of each volunteer.
The response variable is the outcome of the study that the scientists are interested in measuring and analyzing. In this case, it is the memory quiz score of each volunteer. The memory quiz is used as a measure of the effect of caffeine on short-term memory.
The scores of the quiz will be used to determine if there is a significant difference between the scores of the group that consumed caffeine and the group that consumed the placebo.
The response variable will be used to draw conclusions about the effect of caffeine on short-term memory and it can be quantitative in nature. The scores can be analyzed and compared to understand the relationship between caffeine intake and memory retention.
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Consider the reaction
2A + B C
-
(a) In the diagram here that represents the re-
action, which reactant, A or B, is the limiting reagent?
(b) Assuming complete reaction, draw a molecular-model representation of the amounts of reactants and products left after the reaction. The
atomic arrangement in C is ABA.
Answer:65
Explanation:
Use the reaction below for the combustion of ammonia gas to
produce nitrogen monoxide and water vapor.
4NH3(g) + 302(g) → 4NO(g) + 6H₂O(g)
What volume of O2 is needed to react fully with 720. mL of
NH3?
a) 960 mL O2
b) 1.02 L O2
c) 720. mL O2
d) 540. mL O2
oxides of active metals, such as cao, react with water to form?
Active metals, such as calcium oxide (CaO), react with water to form an oxide-water reaction.
This reaction produces an alkaline solution, which has a pH higher than 7. As a result, the water will become less acidic, and the oxide will be converted into its hydrated form.
This reaction is an important part of the water treatment process, since it helps to reduce the acidity of water and make it safer for drinking.
Additionally, the alkaline solution produced by the reaction can be used to neutralize acidic materials, making it useful for a variety of industrial and environmental applications.
Active metals such as calcium oxide (CaO) are capable of reacting with water to form oxides.
The reaction between the oxides and water can be used in a variety of different applications, such as to create materials with high strength and durability, or to generate power through the combustion of the oxides.
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Drag each label into the appropriate position to identify which chemical classification it describes. - Steroid - Peptide 1. Utize CAMP DAG, or IP3 systems 2. Bind to receptors in the cells nucleus 3. Require a transport protein 4. Hydrophobic 5. Pass directly through the plasma membrane 6. Hydrophilic 7. Elicit responses over several hours to days 8. Elicit responses almost immediately 9. Require second 10. Bind to membrane bound receptors messenger systems
Peptides are hydrophilic, elicit immediate responses, require secondary messenger systems and binds to membrane bound receptors whereas steroids are hydrophobic, requires a transport proteins, binds to the receptors which are present on the nucleus of the cell.
Steroids are hydrophobic in nature and due to this hydrophobic nature, they are able to pass through the plasma membrane directly. They bind to the receptors which are present in the nucleus and not on the plasma membrane. They do not elicit response immediately but take several hours to even days.
Peptides being hydrophilic cannot cross the plasma membrane directly. They bind to the receptors which are present on the plasma membrane. They use the DAG, cAMP or IP3 systems.
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particle derives its name from the fact that it has no electrical charge; it is neutral and found in the nucleus of an atom____
Because it is electrically neutral and can be found in the nucleus of an atom, this particle is known as a neutron. The nucleus contains the neutron, an elementary particle.
Except the atom of pure hydrogen. The fact that the particle has no charge and is electrically neutral gives rise to its name. Neutrons have the highest density. Every atom's nucleus, with the exception of basic hydrogen, is home to a neutron, a subatomic particle. The fact that the particle has no charge and is electrically neutral gives rise to its name. Neutrons have the highest density. Hydrogen is a chemical element with atomic number 1 and the letter H. Hydrogen is the lightest element.
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should you add concentrated acid to water or add water to concentrated acid?
Answer:
Add acid to water, carefully.
Explanation:
"Do as ya aughta
Add acid to wata"
The heat released when water hits concentrated acid can result in the water vaporizing violently, caused the acid to splatter. This is less pronounced when adding acid to water.
PLEASE HELP!!! Lead (II) nitrate as Pb(NO3)2 and potassium iodide as KI combine to form the products shown.
2 KNO3 + PbI2
How many moles of each reactant are involved in the reaction?
(1 point)
Responses
2 moles of lead (II) nitrate and 2 moles of potassium iodide
2 moles of lead (II) nitrate and 2 moles of potassium iodide
1 mole of lead (II) nitrate and 1 mole of potassium iodide
1 mole of lead (II) nitrate and 1 mole of potassium iodide
1 mole of lead (II) nitrate and 2 moles of potassium iodide
1 mole of lead (II) nitrate and 2 moles of potassium iodide
2 moles of lead (II) nitrate and 1 mole of potassium iodide
The number of moles of each reactant involved in the reaction are as follows: 1 mole of lead (II) nitrate and 2 moles of potassium iodide (option C).
What is a chemical reaction?A chemical reaction is said to occur when there is a breaking or formation of interatomic bonds and involves the transformation of one or more substances into others.
This question states that lead (II) nitrate and potassium iodide react to form potassium nitrate and lead iodide as follows:
Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃
It can be observed from the above equation that 1 mole of lead nitrate and 2 moles of pottasium iodide are needed on the reactant sides.
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rank these liquids by their expected surface tension. rank from greatest to least surface tension. to rank items as equivalent, overlap them.
The Greatest to low Surface Tens-ion is given as:
Hydrogen bonding > dipole dipole interactions > van der forces.
The surface tens-ion is the ratio of the surface for-ce F and the length L along which for-ce acts.
surface tens-ion, T = F / L
The more the surface force the greater the surface tens-ion. The surface tens-ion depend upon the force of attraction between the molecules. The surface tens-ion dose not depends upon the surface area. It is given as :
Hydrogen bonding > dipole dipole interactions > van der forces.
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An apple placed in a sealed
container has a mass of 160
grams. What would the mass of
the apple be after 6 weeks of
decomposition?
A. 160 grams
B. 80 grams
C. 40 grams
The apple weighs 80 grams after 6 weeks of deterioration. The correct answer is option (B).
Does decomposition lose mass?More recalcitrant chemicals are degraded in the latter stages of breakdown. Decomposition reactions occur when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input. Simply put, mass is a measurement of a body's amount of matter. Matter is everything that has both volume and mass.
Although not linearly, the overall percentage of decomposition was highly correlated with carcass mass. A particle's or an object's mass is a dimensionless number that indicates how much matter is present. The kilogram serves as the standard mass unit in the International System (SI).
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Answer:
the correct answer is A.
Explanation:
How is 2 ATP produced in the Krebs cycle?.
2 ATP produced in the Krebs cycle from each pyruvate molecule during the conversion of succinyl-CoA to succinate.
In the presence of the enzyme succinyl CoA synthetase, Kreb's cycle only generates 1 molecule of ATP from each pyruvate molecule during the conversion of succinyl-CoA to succinate.
Glycolysis converts one glucose molecule into two pyruvate molecules, both of which enter the Kreb's cycle at the same time.
Thus, when one glucose travels through aerobic respiration, 2 ATP are ultimately created from Kreb's cycle through substrate-level phosphorylation.
The reduced coenzymes NADH and FADH₂ work as intermediary chemicals in the citric acid cycle to supply protons and electrons to the electron transport chain. The subsequent oxidative phosphorylation produced by the electron transport chain produces more ATPs. In addition to producing 2 ATP, the citric acid cycle also phosphorylates its substrate.
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click on sulfur. this element exists as rings. how many atoms is each sulfur atom bonded to?
Sulfur exists in the form of [tex]S_8[/tex] which occurs as ring structure.
The molecule that represents elemental sulfur in its most prevalent form, a cyclic or ring-like structure made up of eight sulfur atoms, has the chemical formula S8. The S8 ring, which is made up of alternating single and triple covalent connections between the sulfur atoms, is a stable and largely inert structure.
The S8 ring can adopt several conformations since it is sufficiently flexible to rotate thanks to its solitary covalent bond. The S8 ring is a moderately stable molecule that is kept together by van der Waals and covalent forces in both the solid and liquid states. It is a crucial component of numerous minerals and organic compounds found in nature and is employed in a number of commercial and agricultural processes.
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If an element is written in hyphen notation, such as
Phosphorous-32, what would the mass of one mole of
this element be?
The mass of one mole of phosphorus-32 is approximately 31.97 g/mol.
What is Phosphorus-32?The chemical element phosphorus has an isotope called phosphorus-32 (P).Its atomic nucleus contains 32 protons, giving it a unique atomic number.Due to its total of 32 nucleons, phosphorus-32 has a mass number of 32 (protons and neutrons).Because phosphorus-32 is a stable isotope, it does not decay radioactively.mole is frequently created in nuclear reactors, but it can also be acquired naturally.In industrial and environmental investigations, phosphorus-32 is frequently utilized as a tracer to monitor the motion and behavior of chemical molecules.Phosphorus-32 is used in medicine to treat cancer because it generates beta particles that can kill cancer cells.To learn more about phosphorus-32 from the given link:-
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How many molecules are in 0. 25 moles of H2O?.
There are 1.505×10²³molecules in 0.25 moles of H2O.
No of moles= 0.25moles
No of molecules = ?
NA(avogadro constant) = 6.022×10²³molecules
No of molecules =no of moles×NA
= 0.25moles×6.022×10²³molecules
=1.505×10²³molecules
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Mole Ratio Practice
A chemical reaction's mole ratio, which is determined from the coefficients of the constituent substances in a balanced equation, is a conversion factor between the compounds.
What is the mole ratio?In a balanced chemical reaction, the ratio of any two compounds' mole amounts—measured in moles—is known as the mole ratio. In the balancing chemical equation, the ratios of the molecules required to accomplish the reaction are compared. A balanced equation cannot have a mole ratio calculated. In many chemistry situations, the ratio of reactants to products is calculated using moles.Take a look at the chemical formula N2 + 3H2 2NH3 to see how it balances.In this case, N2 coefficients equal 1.H2 = 3 has coefficients.Indicators for NH3 are 2Input for the chemical equation came from this coefficient's molecular details.In this equation, 1 mole of nitrogen (N2) interacts with 3 moles of hydrogen (H2) to create 2 moles of ammonia (NH3).To Learn more About mole ratio, Refer To:
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What i the name of the exothermic proce in which a olvent interact with it olute?
precipitation
olvation
aturation
micibility
Salvation is an exothermic process in which a solvent interact with it solute.
What is SolvationSolvation or solution can be interpreted as a system in which solute molecules are dissolved in a solvent. Water is often called a universal solvent and includes a strong solvent . The composition of the solute and solvent in the solution is expressed as the concentration of the solution, while the process of mixing the solute and solvent to form a solution is called dissolution or solvation. Water is a strong solvent dissolves many kinds of chemical substances . The solubility of a substance in water is determined by whether or not the substance can oppose the strength of the electric attraction between water molecules. Solubility (solvation) is a function of a molecular parameter.
Ionization structure and molecular size Stereochemistry and electronic structure. Everything will affect the action of the solvent and the solute, as in the previous section, water forms hydrogen bonds with ions or with non-ionic compounds, while polar through -OH, -NH groups, or with unbonded electron pairs on an oxygen or nitrogen atom. Ions or molecules will get the sample hydrate and will separate from the chunks of solid matter and that means dissolve.
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how many grams of water are produced when 44 grams of propane react?
When 44 grams of propane reacts, 72.0 g of water is produced.
The molar mass of propane (C₃H₈) is 44 g/mol and that of water (H₂O) is 18 g/mol.
44.0 grams of propane is equivalent to 1 mole of propane.
According to the balanced chemical equation,
C₃H₈+ 5O₂ → 3CO₂ + 4H₂O
1 mole of propane produces 4 moles of water.
So, burning 44.0 g (1 mol) of propane will produce 4 moles of water.
Mass of water = moles x molar mass
Mass of water = 4 × 18 = 72.0 g.
So, the mass of water is 72.0 g.
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what is the approximate residence time for a water molecule in a river?
The residence time for a water molecule in a river is typically between 1 and 5 days.
What is molecule?A molecule is the smallest particle of a substance that can still be identified as that substance. Atoms are held together via molecular bonds to form molecules. Molecules can be as little as two atoms or as large as thousands of atoms. Atoms are held together via molecular bonds to form molecules. Molecules can be as little as two atoms or as large as thousands of atoms. The properties of a molecule are determined by the arrangement of its atoms and the type of chemical bonds that hold them together. Molecules can exist as individual particles or as part of a larger structure. Molecules can be found in all forms of matter including gases, liquids, and solids. They are the building blocks of all living things and play an important role in chemical reactions.
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which electrolyte is a major cation in body fluid?a. Potassiumb. Chloridec. Phosphated. Bicarbonate
Potassium is a major cation in body fluid. It is a crucial electrolyte and mineral that is necessary for numerous bodily physiological processes.
What are the functions of potassium?
It performs several tasks, such as:
regulating fluid equilibriumsustaining normal nerve and muscle functionmaintaining cardiovascular healthlowering the risk of high blood pressure and strokeIn order to keep the body's acid-base balance in check, potassium is also crucial.It can be taken as a supplement in addition to being present in many foods, including dairy products, fruits, and vegetables.It aids in the proper operation of muscles and nerves, the regulation of fluid balance, and the maintenance of optimal blood pressure levels. In addition, potassium is necessary for the heart and kidneys to operate properly. A lack of potassium can cause a number of health problems, such as exhaustion, muscle weakness, and irregular heartbeats. Bananas, sweet potatoes, and avocados are some foods high in potassium that you should eat regularly to guarantee appropriate intake of this vital mineral.To learn more about potassium refer to:
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In the activity series, the more active elements are found
(a) at the bottom
(b) in the middle
(c) at the top
(d) both (a) and (c)
Answer:
Number three the answer is d
Which orbital is portrayed on the right?
A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.
What's the appearance of the p orbital?A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.Each shell can only carry a certain amount of electrons: the first shell can hold two electrons, the second shell can hold eight electrons (2 + 6) and so on, the third shell can hold 18 electrons (2 + 6 + 10).To learn more about orbital refer to:
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Plants such as the venus flytrap produce chemical compounds that break down insects into substances that are usable by the plant. The chemical compounds that break down the insects are most likely.
The chemical substance that the Venus flytrap produces can be thought of as a biological catalyst.
Enzymes can be thought of as biological catalysts.
Plants that break down insects into components the plant can use, like the Venus flytrap, create chemical compounds. Most likely, BIOLOGICAL CATALYSTS are what breaks down the insects' chemical makeup. Among plants, the Venus Flytrap is a carnivore. It possesses a mechanism that captures other species and finally ingests them. It smells bad because of what it consumes. There are various carnivorous plants that use different methods to draw in and capture small animals or species.
This enzyme can be thought of as a biological catalyst that quickens a chemical reaction while maintaining the equilibrium.
The simple fact that the enzymes' actions accelerate up biological reactions within an organism has led to their classification as biocatalysts.
A biological catalyst that aids in turning the insect into material is what the flytrap generated.
As an illustration, consider the salivary enzyme that aids in the conversion of starch to simple sugar.
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When using a Van de Graaff generator charges repel because all the charges are all
When using a Van de Graaff generator charges repel because all the charges are negatively charged.
Why does the Van de Graaff become negatively charged?The Van de Graaff become negatively charged, because the rubber belt is an insulator and a poor conductor of electricity, the positive charge does not spread evenly across the belt.
Instead, as a result of electric induction, the inside of the belt remains positively charged, while the outside of the belt becomes negatively charged.
Thus, When using a Van de Graaff generator charges repel because all the charges are negatively charged.
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What is the minimum internal temperature that the turkey must reach?
The minimum internal temperature that the turkey must reach is 165°F or 73.9°C as measured with a food thermometer.
A food thermometer is a thermometer specifically used to measure the temperature of food to make sure the food is cooked. There are various types of food thermometers that can be used to measure food temperature according to the type of food such as meat thermometers, skewer thermometers and oven thermometers.
The minimum internal temperature for a turkey that must be reached to ensure it is cooked is 165 °F or or 73.9 °C. Likewise, the stuffing that is put into the turkey must follow the temperature of the turkey to be removed from heating, which is at 165 °F. Because if it is removed before the temperature is 165°F, the turkey is not fully cooked and can cause the bacteria that are still able to survive so that those who consume the stuffing can be poisoned.
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To reach an absolute pressure of 3atm, you must dive down (in water) to depth of approximately 20m. Why might someone think that the answer was 30m?.
The gauge pressure at a depth below the surface of a water is 3.0 atm.
If a person cannot tell the difference between gauge pressure and absolute pressure, they might believe the height (depth) is 30 metres.
Given the information below:
A = 3 atm is the atmospheric pressure.
A = 20 metres for height vs depth.
• 30 metres of depth at height.
Scientific evidence
• Gravitational acceleration is 9.8 m/s2.
• Water has a density of 1000 kg/m3.
In order to determine the gauge pressure at a depth below the water's surface:
Gauge pressure can be calculated mathematically using this formula:
P = pgh
where: G is the gravitational acceleration.
Water is at a height (depth) of h.
The formula reads as follows when the supplied parameters are substituted: P = 1000 × 9.8 x 30 Gauge pressure = 294000 Pa
The figure in Pascals would then be converted to atmosphere.
Conversion:
1 atm equals 101325 Pa, and X atm is 294000 Pa.
X = 294000 / 101325 X = 2.90 X = 3.0 atm is the result of cross-multiplying.
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Rearrange the work equation and show the equation for force.
Work equation: W=Fxd
The equation for force when derived from the equation for work is F = W / D
How to find the equation for force ?A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull.
The work equation states that the work done (W) is equal to the force (F) applied to an object multiplied by the distance (d) over which the force is applied, and is given by the equation:
W = F x d
The equation for force can be obtained by rearranging the work equation to solve for F:
F = W / d
This equation shows that force is equal to the work done divided by the distance over which the force is applied. So, if the work done and the distance are known, the force can be calculated by using this equation.
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compare the size of ions to the size of atoms from which they form
The negative ion is always significantly bigger than the atom it originated from. In actuality, the negative ion may be larger than the neutral atom by a factor of more than two.
Ions are defined as atoms that gain or lose electrons. When an atom receives or loses its outermost electron, its size (or radius) changes. This change is known as the ionic radius (s). A negatively charged ion known as an anion is created when an atom receives an extra electron, increasing its ionic radius. Positive ions are smaller than their parent atoms, whereas negative ions are bigger. Trend over a time period: Moving across the table from left to right causes the ionic radius to shrink. In any given period, negative ions are always bigger than positive ions.
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estimate the boiling point of a 2m solution of nacl in water.
The boiling point of water is raised by 1.88K when a 2 molal solution of sodium chloride is added to water.estimate the boiling point of a 2m solution of nacl in water.
Pour 11.69 g of NaCl into a suitable beaker (100 mL beaker in this case). Increase the amount to 100 mL by adding deionized water. Add a stir bar to the beaker and leave it on a stir plate for 1 minute, or until thoroughly dissolved. If desired, sterile-filter and transfer to an adequately labeled container. When a 2 molal solution of sodium chloride is added to water, the boiling point rises by 1.88K. Fill an appropriate beaker with 11.69 g of NaCl (100 mL beaker in this case). Add deionized water to bring the total to 100 mL. Place the beaker on a stir plate and leave it for 1 minute, or until totally dissolved. If desired, sterile-filter the solution and transfer it to a properly labeled container.
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Which of the following elements is a noble gas?
A) Sodium
B) Chlorine
C) Argon
D) Calcium
Answer:
The correct answer is C.) Argon.
Explanation:
Noble gases are a group of elements in the periodic table that are characterized by their low reactivity and tendency to remain as gases at standard temperature and pressure. Argon is one of the noble gases, along with helium, neon, krypton, xenon, and radon. These elements have full electron shells, which makes them stable and unreactive, and they do not easily participate in chemical reactions.
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