How many protons are in the nucleus of an atom with an atomic number of 20?

Question

How many protons are in the nucleus of an atom with an atomic number of 20?

A. 10

B. 20

C. 40

D. 60

Correct Answer :

B. 20

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What is the chemical formula for water?

A. H2O

B. CO2

C. CH4

D. O2

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Which type of bond involves the sharing of electrons?

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What is the chemical formula for aspirin?

B. CH4

C. C9H8O4

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What is the chemical symbol for silver?

A. Ag

B. Au

C. Si

D. Sr

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The atomic number of an element is determined by the number of:

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What is the formula for the hydroxide ion?

A. OH2

B. H2O

C. HO

D. OH-

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Which gas makes up the majority of Earth's atmosphere?

A. Oxygen

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What is the chemical formula for potassium nitrate?

A. KNO3

B. KN2O4

C. K2NO3

D. K3NO2

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Which of the following is a halogen?

A. Sodium

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What is the chemical formula for sulfur hexafluoride?

A. SF6

B. SF5

C. S2F6

D. S2F5

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Which gas is essential for photosynthesis in plants?

B. Oxygen

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What is the chemical formula for ozone?

A. O2

B. H2O

C. CO2

D. O3

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Which of the following is a transition metal?

A. Sodium

B. Iron

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Which element is commonly used in batteries?

D. Zinc

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Which of the following is a greenhouse gas produced by human activities?

A. Oxygen

D. Argon

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Which element is the most abundant in Earth's crust?

A. Oxygen

C. Carbon

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The process of a liquid changing into a gas at the surface is called:

D. Fusion

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What is the chemical formula for carbon monoxide?

A. CO2

B. CH4

C. CO

D. C2O

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What is the atomic number of carbon?

A. 12

B. 14

C. 6

D. 8

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Which of the following is a noble gas?

A. Neon

B. Sodium

C. Oxygen

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Which gas is produced by burning fossil fuels and contributes to air pollution?

A. Oxygen

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Which gas is produced during photosynthesis?

A. Oxygen

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What is the chemical formula for sulfur dioxide?

A. SO2

B. H2SO4

C. SO3

D. H2S

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What is the chemical formula for sodium chloride?

A. NaCl

B. Na2Cl

C. NaCl2

D. Na2Cl2

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Which gas is responsible for the blue color of the Earth's sky?

A. Oxygen

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Which of the following is a lanthanide element?

B. Boron

D. Sodium

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Which element is the most abundant in the universe?

B. Helium

C. Oxygen

D. Carbon

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Which element is the primary component of organic molecules?

B. Oxygen

C. Carbon

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Which gas is used in the process of photosynthesis?

B. Oxygen

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How many electrons are in the outermost energy level (valence shell) of a neutral oxygen atom?

A. 2

B. 6

C. 8

D. 4

Discuss this answer

Answer 1

A. Ionic bond

Answer 2

B. Covalent bond

Answer 3

C. Metallic bond

Answer 4

D. Hydrogen bond

Answer 5

A. C6H12O6

Answer 6

D. C12H22O11

Answer 7

A. Protons

Answer 8

B. Electrons

Answer 9

C. Neutrons

Answer 10

D. Nucleons

Answer 11

B. Carbon dioxide

Answer 12

C. Nitrogen

Answer 13

D. Hydrogen

Answer 14

B. Fluorine

Answer 15

C. Potassium

Answer 16

D. Calcium

Answer 17

A. Carbon dioxide

Answer 18

C. Nitrogen

Answer 19

D. Methane

Answer 20

C. Calcium

Answer 21

D. Potassium

Answer 22

A. Calcium

Answer 23

B. Lithium

Answer 24

C. Aluminum

Answer 25

B. Carbon dioxide

Answer 26

C. Nitrogen

Answer 27

B. Silicon

Answer 28

D. Hydrogen

Answer 29

A. Evaporation

Answer 30

B. Condensation

Answer 31

C. Sublimation

Answer 32

D. Chlorine

Answer 33

B. Nitrogen

Answer 34

C. Carbon dioxide

Answer 35

D. Sulfur dioxide

Answer 36

B. Carbon dioxide

Answer 37

C. Nitrogen

Answer 38

D. Hydrogen

Answer 39

B. Carbon dioxide

Answer 40

C. Nitrogen

Answer 41

D. Rayleigh scattering of sunlight

Answer 42

A. Uranium

Answer 43

C. Lanthanum

Answer 44

A. Hydrogen

Answer 45

A. Nitrogen

Answer 46

D. Hydrogen

Answer 47

A. Carbon dioxide

Answer 48

C. Nitrogen

Answer 49

D. Hydrogen

How many protons are in the nucleus of an atom with an atomic number of 20?

Correct Answer :

Show all AP Chemistry MCQ

Related Questions

What is the chemical formula for water?

Which type of bond involves the sharing of electrons?

What is the chemical formula for aspirin?

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The atomic number of an element is determined by the number of:

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