Atomic Structure Quiz

What is the relative mass of a neutron?

• 1

• 0

• 2

• 1/2

What is the relative mass of an electron?

• 0

• 1

• 2

• 1/2

What is the total number of protons and neutrons in an atom called?

• The atomic number

• The mass number

• One mole of the atom

• The electron number

An atom of carbon has six electrons. Which structure, A, B, or C, represents the electronic structure of the carbon atom?

• Structure A

• Structure B

• Structure C

• Structure D

How many different elements are in one molecule of carbon dioxide (CO₂)?

• 1

• 2

• 3

• 4

What is the total number of atoms in one molecule of carbon dioxide (CO₂)?

• 2

• 3

• 4

• 5

Calculate the relative formula mass (Mᵣ) of carbon monoxide (CO) using the relative atomic masses: C = 12, O = 16.

• 12

• 16

• 28

• 32

Calculate the percentage by mass of carbon in carbon monoxide (CO).

• 30%

• 43%

• 57%

• 75%

Carbon dioxide is one of the gases in the air. Which of the following is true about its presence?

• Carbon dioxide is the most abundant gas.

• Argon is more abundant than carbon dioxide.

• Carbon dioxide is more abundant than argon.

• Neither gas is present in the air.

What is the percentage of argon in the air?

• 0.8%

• 0.6%

• 0.4%

• 0.2%