Isotopes of a given element have the same number of protons or neutrons

(protons)

The (mass number) / (atomic mass) is equal to the sum of protons + neutrons.

(mass number)

metals or non metals tend to gain electrons.

non metals

anions or cations are negatively charged ions.

anions

Isotopes of a given element have a different number of (protons) / (neutrons)

neutrons

The (mass number) / (atomic mass) is equal to the weighted average of masses of naturally occurring isotopes.

atromic mass

Metals) / (nonmetals) tend to lose electrons.

metals

(Cations) / (anions) are positively charged ions.

cations