A 1.50 g sample of a compound containing only C, H and O was burned in an attempt to determine its simplest formula. 3.00 g of CO2 and 1.23 g of H2O were collected. Find the simplest formula for the compound.

Answer:

The volume of air at where the pressure and temperature are  52 kPa, -5.0 ºC is [tex] 3.64 m^3[/tex].

Explanation:

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 104 kPa

[tex]P_2[/tex] = final pressure of gas = 52 kPa

[tex]V_1[/tex] = initial volume of gas = [tex]2.0m^3[/tex]

[tex]V_2[/tex] = final volume of gas = ?

[tex]T_1[/tex] = initial temperature of gas = [tex]21.1^oC=273+21.1=294.1K[/tex]

[tex]T_2[/tex] = final temperature of gas = [tex]-5.0^oC=273+(-5.0)=268 K[/tex]

Now put all the given values in the above equation, we get:

[tex]\frac{104 kPa\times 2.0m^3}{294.1 K}=\frac{52 kPa\times V_2}{268 K}[/tex]

[tex]V_2=3.64 m^3[/tex]

The volume of air at where the pressure and temperature are  52 kPa, -5.0 ºC is [tex] 3.64 m^3[/tex].

The question pertains to how a mass of air's volume changes with altitude in the subject of Physics, using the ideal gas law which relates pressure, volume, and temperature. Actual calculation could not be completed due to the ambiguity in the question's phrasing.

The subject in question relates to Physics, specifically the concepts of gas laws and how changes in pressure, temperature, and volume affect gases. The question involves applying the ideal gas law to determine how the volume of a mass of air changes when altitude affects temperature and pressure.

If we consider the ideal gas law, which states that PV/T = constant for a given mass of air, and if we ignore the effect of humidity and assume the atmospheric air behaves as an ideal gas, we can relate the initial and final states of the mass of air by the equation (P1V1)/T1 = (P2V2)/T2. To find the new volume V2, rearrange the equation to V2 = (P1V1T2)/(P2T1). With all values, including pressures, volumes, and temperatures, it is necessary to convert temperatures to Kelvin before using the formula.

To compute the problem described, we would convert 21.1 ºC to Kelvin by adding 273.15, which is 294.25K, and similarly convert -5.0 ºC to Kelvin, which would give 268.15K. Then, we'd calculate the new volume V2 knowing P1, V1, T1, P2, and T2. However, since the question 'To what volume will the region expand when it has risen to altitude where the pressure and temperature are (a) 52 kPa, -5.0 ºC (True or False)' lacks a clear predicate and the expected answer format (True or False doesn't fit the question being asked), we cannot calculate V2 without additional information or rephrasing of the question.

Answer:

The answer is B. Li

Explanation:

2Li will be needed to form an ionic compound because the known element sulphur requires 2 (two) electron to complete  its octet configuration.

So reacting with Lithium (2Li) will balance their electronic configuration.

Final answer:

Lithium (Li) is the most likely identity for element 'X' because it forms a +1 cation (Li+), which would combine with the -2 charge of a sulfide ion (S₂-) to create the compound Li₂S. Option B

Explanation:

When considering the reaction with sulfur to form an ionic compound of the form X₂S, we are looking for an element that can form a +1 oxidation state to balance the -2 charge on the sulfide ion (S₂-). Among the options provided, lithium (Li) is a member of the alkali metals (group 1) and naturally forms a +1 charged ion (Li+). Therefore, when it reacts with sulfur, it would form Li₂S, making lithium the most likely candidate for element 'X' in the given formula.

Other options, such as magnesium (Mg) and aluminum (Al), are in group 2 and 13 respectively, and typically form +2 and +3 ions. Chlorine (Cl) is a nonmetal and would not form a compound with the general formula X₂S. Cerium (Ce) is a lanthanide and it primarily forms compounds in a +3 or +4 oxidation state, not +1. Therefore, these elements are not suitable candidates for element 'X' given the provided compound formula.

Answer:there is visible blue black coloration

Explanation:starch is a polysaccharide,it is composed of only glucose combined by glycosidic bonds.starch is majorly an insoluble carbonhydrate.

Starch consist of two distinguishable polysaccharide fraction namely amylose and amylopectin.

The iodine test is used to check for the presence of starch.

It gives a blue black coloration for amylose which is present in potato.

But in amylopectin,it gives a reddish coloration.

Answer:

1-butanol has higher boiling point mainly due to presence of hydrogen bonding.

Explanation:

Diethyl ether is a polar aprotic molecule due to presence of polar C-O-C moiety. Hence only dipole-dipole intermolecular force exist between diethyl ether molecules.

1-butanol is a polar protic molecule due to presence of C-OH moiety. Therefore dipole-dipole force along with hydrogen bonding exist between 1-butanol molecules.

So, intermolecular force is higher in 1-butanol as compared to diethyl ether. Hence more temperature is required to break intermolecular forces of 1-butanol to boil as compared to diethyl ether.

So, 1-butanol has higher boiling point mainly due to presence of hydrogen bonding.

Answer:117 degree Celsius

Explanation: this is due to the hydrogen bonding between the OH of the alcohol

Answer:

109.97JK-1

Explanation:

Entropy is the degree of disorderliness of a substance. It is given by ∆H/T where T is the absolute temperature in Kelvin.

Given ∆H= 38.6*10^3

T=78°C+ 273=351K

∆S=38.6*10^3/351=109.97JK-1 as shown the diagram.

Answer:

C. number of neutrons

Explanation:

Isotopes -

For some elements , there are various forms possible , which have different number of neutron , are referred to as the isotopes .

The isotope of a specific element have same number of protons , they only alters in the number of neutrons.

Hence , from the question,

The correct option for the given information is C. number of neutrons .

Answer: C. Number of neutrons

Explanation: Since it indicates the exact same element so the number of protons must be the same as it represents the atomic number. Isotopes of the exact element have an altered number of neutrons on its nucleus.

Answer: the integers are 9,11 and 13

Explanation:Please see attachment for explanation

Answer:

B. Household ammonia.

Explanation:

NH₃ is a base, so the solution always will be basic.

NH₃ takes the proton from the water. In conclusion we have free OH⁻ in medium, that's why the solution is basic.

NH₃ + H₂O → NH₄⁺  +  OH⁻

- HCl + H₂O → H₃O⁺  + Cl⁻

This reaction makes an acid solution, cause the H₃O⁺

- Vinegar is a compound made of acetic acid.

CH₃COOH  + H₂O  ⇄  H₃O⁺  +  CH₃COO⁻

This reaction also makes an acid solution, cause the H₃O⁺

- Pure water makes neutral solution. It is not acid, neither basic.

2H₂O ⇄  H₃O⁺  +  OH⁻

Answer:

D. a scientific explanation that is agreed on by all scientists and is no longer adjusted as new evidence is found

Explanation:

Scientific theory is an explanation that has been repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results

Answer:

"B"an explanation for something that is frequently adjusted as evidence is collected

Answer:

C

Explanation:

when an ion has a 1- charge it gains 1 electron. when an atom is neutral, it has the same protons as electrons.

Answer:

2 ATP

Explanation:

glycolysis is the beginning of cellular respiration and it yielded net ATP of two produced from 1,3 bisphosphoglycerate conversion to 3-phosphoglycerate (2 ATP) and conversion of phosphoenolpyruvate to pyruvate ( 2ATP). One will recall that 2 ATP had been expended in the conversion of glucose to glucose-6-phosphate, and in the conversion of fructose-6-phosphate to fructose -1,6- bisphosphate. Other product of glycolysis are 2 NADH, 2 Pyruvate that may go into kreb  cycle for further energy production depending on the organism type of respiration.

The net gain of energy in glycolysis from one molecule of glucose is 2 ATP molecules. Glycolysis metabolizes one glucose to form two pyruvate molecules while generating a net gain of 2 ATP and 2 NADH.

The net gain of energy in glycolysis from one molecule of glucose is 2 ATP (Adenosine Tri-Phosphate) molecules. Glycolysis is the process in which one glucose molecule is broken down to form two molecules of pyruvate (also known as pyruvic acid). The process also generates 2 molecules of ATP as net gain, along with 2 NADH molecules. However, because the input also includes the use of 2 ATP molecules in the 'energy investment phase', the net gain is only 2 ATP.

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Answer:

b) c) and d)

Explanation:

a) octane. Organic, does not mix with water or form aqueous solution in water insoluble in water

b) potassium bromide. Easily mixes with water soluble in water

c) sodium bromide. Easily mixes with water soluble in water

d) lithium chloride. Easily mixes with water soluble in water

e) heptane. Organic, does not mix with water or form aqueous solution in water insoluble in water

The question is incomplete, here is the complete question:

Suppose 0.829 g of zinc chloride is dissolved in 100. mL of a 0.60 M aqueous solution of potassium carbonate. Calculate the final molarity of chloride anion in the solution. You can assume the volume of the solution doesn't change when the zinc chloride is dissolved in it. Round your answer to 2 significant digits.

Answer: The final molarity of chloride ion in the solution is 0.12 M

Explanation:

To calculate the number of moles for given molarity, we use the equation:

[tex]\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}[/tex]     .....(1)

Molarity of potassium carbonate solution = 0.60 M

Volume of solution = 100. mL

Putting values in equation 1, we get:

[tex]0.60M=\frac{\text{Moles of potassium carbonate}\times 1000}{100}\\\\\text{Moles of potassium carbonate}=\frac{(0.60\times 100)}{1000}=0.06mol[/tex]

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

Given mass of zinc chloride = 0.829 g

Molar mass of zinc chloride = 136.3 g/mol

Putting values in above equation, we get:

[tex]\text{Moles of zinc chloride}=\frac{0.829g}{136.3g/mol}=0.0061mol[/tex]

The chemical equation for the reaction of potassium carbonate and zinc chloride follows:

[tex]ZnCl_2+K_2CO_3\rightarrow ZnCO_3+2K^+(aq.)+2Cl^-(aq.)[/tex]

By stoichiometry of the reaction:

1 mole of zinc chloride reacts with 1 mole of potassium carbonate

So, 0.0061 moles of zinc chloride will react with = [tex]\frac{1}{1}\times 0.0061=0.0061mol[/tex] of potassium carbonate

As, given amount of potassium carbonate is more than the required amount. So, it is considered as an excess reagent.

Thus, zinc chloride is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

1 mole of zinc chloride produces 2 moles of chloride ion

So, 0.0061 moles of zinc chloride will produce = [tex]\frac{2}{1}\times 0.0061=0.0122mol[/tex] of acetate ion

Now, calculating the molarity of chloride ions in the solution by using equation 1:

Moles of chloride ion = 0.0122 moles

Volume of solution = 100. mL

Putting values in equation 1, we get:

[tex]\text{Molarity of chloride ions}=\frac{0.0122\times 1000}{100}\\\\\text{Molarity of chloride ions}=0.12M[/tex]

Hence, the final molarity of chloride ion in the solution is 0.12 M

The problem can be solved by converting the mass of zinc chloride into moles and then using the concept of molarity, which is defined as moles of solute per litre of solution. Calculating the molarity of the zinc ions involves dividing the calculated moles by the volume of the solution.

This problem can be solved using the concept of molarity, by which the concentration of a solution is determined. Molarity (M) is defined as moles of solute divided by liters of solution. As you've mentioned the mass of zinc chloride, the first step is to convert the mass of zinc chloride into moles. Zinc chloride (ZnCl2) has a molar mass of approximately 136.29 g/mol. Hence, moles of ZnCl2 = mass/molar mass. Calculating the moles gives us the moles of zinc ions, as each mole of ZnCl2 provides one mole of Zn2+ ions. After finding the moles of Zn, we find the molarity by dividing the moles of Zn by the volume of the solution in liters.

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Final answer:

The contact force is caused by the charged particles that make up one atom pushing or pulling on the charged particles that make up other atoms. This is option B.

Explanation:

The contact force is caused by the charged particles that make up one atom pushing or pulling on the charged particles that make up other atoms.

This is option B.

When two objects are in contact, such as when you push against a wall or walk on the ground, the atoms in your body and the atoms in the object you are in contact with exert electromagnetic forces on each other, resulting in the contact force.

The other options, A, C, D, and E, do not accurately describe the cause of the contact force.

Answer:

H must pair with Fluorine, Oxygen, or Nitrogen

Explanation:

water has polar covalent bonds, the intermolecular forces are hydrogen bonds, London and Dipole forces

Final answer:

The formation of hydrogen bonds requires hydrogen atoms and polar covalent bonds. Hydrogen atoms in polar covalent bonds have a slightly positive charge and are attracted to neighboring negative charges, forming weak interactions known as hydrogen bonds. Hydrogen bonds occur between water molecules and are responsible for many of water's unique properties.

Explanation:

The formation of hydrogen bonds requires hydrogen atoms and polar covalent bonds.

When polar covalent bonds containing hydrogen form, the hydrogen in that bond has a slightly positive charge because hydrogen's electron is pulled more strongly toward the other element and away from the hydrogen. Because the hydrogen is slightly positive, it will be attracted to neighboring negative charges. When this happens, a weak interaction occurs between the hydrogen's 6 from one molecule and the molecule's 6 charge on another molecule with the more electronegative atoms, usually oxygen. Scientists call this interaction a hydrogen bond. This type of bond is common and occurs regularly between water molecules. Individual hydrogen bonds are weak and easily broken, however, they occur in very large numbers in water and in organic polymers, creating a major force in combination. Hydrogen bonds are also responsible for zipping together the DNA double helix.

Answer:

neutrons

Explanation:

Atomic number : It is defined as the number of electrons or number of protons present in a neutral atom.

Mass number is the number of the entities present in the nucleus which is the equal to the sum of the number of protons and electrons.

Mass number = Number of protons + Number of neutrons

Thus both C14 and C12 have same number of protons as they have same atomic number.

The difference in the mass number of both the isotopes is sue to the difference in the number of neutrons.

Atomic number  = Number of protons = 6

For CC- 14, Number of neutrons = 14 - 6 = 8

For C 12, Number of neutrons = 12 - 6 = 6

Answer:

mass number

Explanation:

bc it just is

Answer: D. MIXTURE

Explanation:

It’s important, you first understand the meaning of a pure substance, an element, a compound and a mixture.

A pure substance is a material with a particular composition and consists of only one type of atom or compound. An example is pure sugar.

An element is a substance that cannot be broken down chemically and elements have just one symbol from the periodic table such as Carbon (C), Hydrogen (H).

A compound consists of two or more elements that are bonded chemically. For example, ammonia is a compound with a chemical formula NH3 which means it is means it is made up of 3 moles of Hydrogen and 1 mole of nitrogen.

A mixture contains two or more elements or compounds that are not bonded chemically. It can homogenous or heterogeneous. Examples are salt solution, sand, vinegar.

Vinegar is a mixture of two compounds water and acetic acid and can be separated by physical means because no chemical bond exists between water and acetic acid.

Vinegar is best classified as a mixture because it consists of two different molecules - water and acetic acid - that are not chemically bonded, fitting the criteria of a mixture over an element, compound, or pure substance.

Vinegar is composed of approximately 5% acetic acid and 95% water. Which classification best fits vinegar? The correct choice is D. mixture. Vinegar is a mixture because it contains more than one kind of molecule - in this case, water (H2O) and acetic acid (CH3COOH) - combined in such a way that they can be physically separated. The components of a mixture are not chemically combined, which distinguishes mixtures from compounds. Elements consist of a single type of atom, and pure substances are made of only one type of molecule, thus excluding vinegar from being classified as an element or a pure substance. Therefore, vinegar's composition fits the definition of a mixture.

Answer:

4O₂ (g) + 1/2C₅H₁₂ (g) →  5/2CO₂ (g)  +  3H₂O (g)

4 would be the smallest possible integer for O₂

Explanation:

The balanced equation is this one:

8O₂ (g) + C₅H₁₂ (g) →  5CO₂ (g)  +  6H₂O (g)

If we divide stoichiometry /2 (the half) we can consider that we use, the smallest possible integers.

8/2O₂ (g) + 1/2C₅H₁₂ (g) →  5/2CO₂ (g)  +  6/2H₂O (g)

4O₂ (g) + 1/2C₅H₁₂ (g) →  5/2CO₂ (g)  +  3H₂O (g)

Final answer:

The correct coefficient for O₂ when balancing the combustion of pentane equation is 8, as it provides the required 16 oxygen atoms to balance the equation.

Explanation:

To balance the chemical equation for the combustion of pentane (C₅H₁₂), we will need to follow a systematic approach.

Write down the unbalanced equation: ? O₂(g) + ? C₅H₁₂(g) → ? CO₂(g) + ? H₂O(g)

Balance the carbons first: Since there are 5 carbons in pentane, we need 5 CO₂ molecules on the product side to balance the carbon atoms.

Balance the hydrogens second: Pentane has 12 hydrogen atoms, so we need 6 H₂O molecules to balance the hydrogen atoms since each H₂O has 2 hydrogen atoms.

Balance the oxygens last: There are now 10 oxygen atoms from the CO₂ and another 6 from the H₂O, making a total of 16 oxygen atoms on the product side. Since O₂ has 2 oxygen atoms, we need 8 O₂ molecules to balance the oxygen atoms.

The balanced equation becomes: 8 O₂(g) + C₅H₁₂(g) → 5 CO₂(g) + 6 H₂O(g)

The appropriate coefficient for O₂ when the equation is balanced using the smallest possible integers is 8.

Explanation:

A property that does not bring any change in chemical composition of a substance are known as physical properties.

For example, shape, size, mass, volume, density, hardness etc of a substance are all physical properties.

On the other hand, a property that changes chemical composition of a substance is known as chemical property.

For example, precipitation, reactivity, toxicity etc are chemical property.

Therefore, given descriptions are separated according to their physical and chemical properties as follows.

Physical properties:

Chemical properties:

Zinc's physical properties include hardness on the Mohs scale, density at a certain temperature, and melting point. Its chemical properties include its reaction with sulfuric acid to release hydrogen and dissolve, and its ability to react with oxygen to form zinc oxide.

The descriptions of zinc can be categorized into physical properties and chemical properties. Physical properties are characteristics that can be observed without changing the identity of the substance. For zinc, the physical properties include its hardness on the Mohs scale (2.5), its density (7.13 g/cm³ at 25°C), and its melting point (420°C).

On the other hand, chemical properties can only be observed during a chemical reaction, changing the substance's identity. For zinc, the chemical properties include its reactivity with sulfuric acid, which releases hydrogen and dissolves the metal, and its reaction with oxygen gas at elevated temperatures to form zinc oxide (ZnO).

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Answer: add the acid to the water

Explanation:

Answer:

A. Electrochemical Cell

Explanation:

Answer:

Hi

The high dipole moment of water and its ease in forming hydrogen bonds make it an excellent analysis. A molecule is soluble in water if it can interact with its molecules through hydrogen bonds or ion-dipole interactions.

With anions that have oxygen they can form hydrogen bonds, since oxygen acts as their acceptor. The attraction of the anion on the water dipole must be taken into account. The same goes for Cl-F, which have solitary electron pairs and can act as hydrogen bridge acceptors. On the other hand, cations such as Na+, K+, Ca++ or Mg++ are surrounded by water molecules to which they are joined by dipole ion interactions while oxygen atoms are oriented towards the catión.

Explanation:

Answer:

The coefficient of Al2O3 is 1

Explanation:

Step 1: Data given

The unbalanced equation: Cu + Al2O3 → Al + CuO

Step 2: Balancing the equation

On the left side we have 2x Al (in Al2O3) on the right side we have 1x Al. To balance the amount of Al, we have to multiply Al on the right side by 2

Cu + Al2O3 → 2Al + CuO

On the left side we have 3x O (in Al2O3), on the right side we have 1x O (in CuO). To balance the amount of O, we have to multiply CuO on the right side, by 3

Cu + Al2O3 → 2Al + 3CuO

On the right side we have 3x Cu (in 3CuO), on the left side we have 1x Cu. To balance the amount of Cu on both sides, we have to multiply Cu (on the left side) by 3.

Now the equation is balanced.

3Cu + Al2O3 → 2Al + 3CuO

The coefficient of Al2O3 is 1

Answer: option B. Black ice is an example of a physical change

Explanation:

Black ice forming on a road or sidewalk is an example of a physical change because it involves a transformation in the physical state of water (from liquid to solid) without changing its chemical composition.

The correct answer is option B.

Black ice forms when a thin layer of water on a sidewalk or road freezes after the temperature drops below the freezing point. This process involves a physical change, not a chemical change. Here's why:

Physical Change:

A physical change is a transformation in which the substance's chemical composition remains the same, but its physical properties, such as state of matter or appearance, are altered. Black ice is formed when liquid water (H₂O) undergoes a physical change as it freezes into solid ice. During this process, water molecules reorganize themselves into a crystalline structure, but the chemical identity of the molecules (H₂O) remains unchanged. Thus, black ice is still composed of H₂O molecules, making it a physical change.

Chemical Change vs. Physical Change:

In a chemical change (chemical reaction), the substances involved undergo a transformation at the molecular or atomic level, leading to the creation of new substances with different chemical compositions. In contrast, physical changes do not alter the chemical composition of the substances; they only affect their physical properties.

In the case of black ice, no new substances are formed, and the chemical composition (H₂O) remains constant throughout the process. Therefore, it is a clear example of a physical change.

Therefore, from the given options the correct one is B.

For more such information on;Black ice

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Answer:

The answer to your question is a) catalyst

Explanation:

a) Catalyst.  A catalyst is a substance that speeds up a reaction but it is not consumed by the reaction.

b) Oxidizing agent.  It is a substance that reduces and can oxidize other substances.

c) Reducing agent.  It is a substance that oxidizes and can reduce other substances.

d) Antioxidant. It is a substance that prevent substances from oxidation.

When Ca(OH)2 and HNO3 are mixed, the dominant components in the solution are H2O, Ca2+, OH-, and NO3-

When one mole of Ca(OH)2 and four moles of HNO3 are mixed in water, the dominant components in the solution would be H2O, Ca2+, OH-, and NO3-. The balanced chemical equation for the reaction is:

Ca(OH)2 + 2HNO3 → Ca(NO3)2 + 2H2O

The reaction between Ca(OH)2 and HNO3 results in the formation of calcium nitrate (Ca(NO3)2) and water (H2O), while the hydroxide ions (OH-) and nitrate ions (NO3-) remain in solution.

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The law of conservation of mass was developed from past observations, it is not subject to experimentation and revision, and it does not explain why mass is conserved or predict future observations.

A) True. The law of conservation of mass was developed from past observations. It was formulated based on multiple experiments and observations by scientists.

B) False. The law of conservation of mass is not subject to experimentation and revision. It is accepted as a fundamental principle in chemistry and holds true under all conditions.

C) False. The law of conservation of mass does not explain why mass is conserved. It is a statement that describes the behavior of mass in chemical reactions, but the underlying reasons are explained by other scientific principles and theories.

D) False. The law of conservation of mass does not predict future observations. It is a statement that describes an observed behavior in chemical reactions.

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Answer : The temperature in Kelvin is, 290 K

Explanation :

S.I : It is known as the international System of Units. It is defined as a scientific method to express the magnitude of the several basics units.

There are seven basic units in the system from which the other units are derived.

The seven base unit are, meter for length, kilogram for mass, second for time, ampere for current, kelvin for temperature, mole for amount of substance and candela for intensity.

The conversion used for the temperature from degree Celsius to Kelvin is:

[tex]K=273.15+^oC[/tex]

where,

[tex]K[/tex] = temperature in Kelvin

[tex]^oC[/tex] = temperature in centigrade

As we are given the temperature in degree Celsius is, 17

Now we have to determine the temperature in Kelvin.

[tex]K=273.15+^oC[/tex]

[tex]K=273.15+(17^oC)[/tex]

[tex]K=290.15K\approx 290K[/tex]

Therefore, the temperature in Kelvin is, 290 K

Answer:

B. False

Explanation:

Solution -

A solution is referred to be a uniform mixture of various components ,  where the components are classified as solute and solvent .

The components can easily be segregated on the basics of the amount of the component , i.e. ,

And ,

For example ,

In the solution of sugar and water , where 1 tablespoon of sugar is dissolved in 100 mL of water ,

and ,

Answer:Elements of even atomic number and mass number are more stable than elements of odd atomic and mass numbers

Explanation: The fact that elements possessing even number of nucleons are more stable and abundant suggests that nucleons are paired in the nucleus. This even number of nucleons is commonly called a magic number because bit is associated with extra stability, abundance of elements and plenitude of isotopes of such elements.

These magic numbers are often numbers which are multiples of four.