Question

Atom W has 9 protons and 9 neutrons, Atom X has 8 protons and 9 neutrons. Atom Y has 9 protons, and 9 neutrons. Atom Z has 10 protons and 10 neutrons. What are the isotopes?

Answer 1

Answer:

Isotopes are atoms with the same number of protons but that have a different number of neutrons.

W and Y are isotopes since they have the same number of protons (9) but that have a different number of neutrons.