Question

1. which subatomic particle determines the identity of an element?

a) neutron
b) proton
c) electron
d) nucleus

1. mass number is equal to:

a) protons + neutrons
b) protons + electrons
c) neutrons + electrons
d) protons only

Explanation:

For question 4, the number of protons in an atom's nucleus, known as the atomic number, determines the identity of an element. Different elements have different numbers of protons. For question 5, the mass number of an atom is the sum of the number of protons and neutrons in its nucleus. Electrons have negligible mass compared to protons and neutrons and are not included in the mass - number calculation.

Answer:

1. b) Proton
2. a) Protons + Neutrons