1. Which is a subatomic particle?

A. atom

C. molecule

B. electron

D. nucleus

2. Which subatomic particles are inside the nucleus of an atom?

A. proton and neutron

C. proton and electron

B. electron and neutron

D. electron and nucleus

3. It tells the identity of an element and is equal to the number of protons.

A. atomic mass

C. both A and B

B. atomic number

D. none of these

4. What is the atomic number of Magnesium (Mg)?

A. 12

C. 36

B. 24

D. 38

5. What is the number of neutron of Mg?

A. 12

C. 36

B. 24

D. 48 ​