Question

select all the answers that describe an isotope of an atom. oxygen 16 oxygen 17 oxygen 18 have a different number of electrons. have a different number of protons. have a different atomic mass. have a different of neutrons. have a different atomic number.

Explanation:

Isotopes are atoms of the same element (so same number of protons and atomic number) but with different numbers of neutrons. Since atomic mass = number of protons + number of neutrons, different neutrons lead to different atomic masses. Electrons are not relevant as isotopes are about nuclear composition (protons and neutrons).

Answer:

• have a different atomic mass.
• have a different number of neutrons.