Topic 2: Atomic structure

Question 1

Mass number (Ar)

Answer 1

The sum of the number of neutrons and protons in an atomic nucleus

Question 2

atomic number (Zr)

Answer 2

the number of protons in one atom of a particular element.

Question 3

isotopes of an element?

Answer 3

Isotopes of an element have nuclei with the same number of protons (the same atomic number) but different numbers of neutrons. Therefore, isotopes have different mass numbers, which give the total number of nucleons-the number of protons plus neutrons.