Topic 2: Atomic Structure

Question 1

The atomic (or proton) number

Answer 1

the number of protons in the nucleus of the atom

Question 2

The mass (or nucleon) number

Answer 2

number of protons + neutrons

Question 3

The number of neutrons

Answer 3

mass number − atomic number

Question 4

Isotopes

Answer 4

Isotopes are atoms of the same element that have the same number of protons in the nucleus but a different number of neutrons. In other words, isotopes of the same element have the same atomic number but a different mass number.