Question

a mass spectrometer measures neon to have two masses: 20 and 22 atomic mass units. these are: a isotopes b ions c compounds

Explanation:

Isotopes are atoms of the same element with different mass numbers due to different numbers of neutrons. Neon - 20 and neon - 22 are isotopes of neon. Ions are atoms or molecules that have a net electric charge. Compounds are substances composed of two or more different elements chemically combined.

Answer:

A. isotopes