Question

For each set of atoms, identify the isotopes?

Answer 1

Isotopes have different neutrons right?
Therefore the mass number would be different.
( mass number = no. of neutrons + no. of protons )
Isotopes have the no. of electrons and same no. of protons therefore the atomic number won't change.
(atomic number = no. of electrons or no. of protons)
Summary: Choose the elements with the same atomic number but different mass numbers.