Question

what is it called when there are two of the same element that have the same number of protons and electrons, but a different number of neutrons? proton isotope compound mixture

Explanation:

Isotopes are atoms of the same element with the same number of protons and electrons, but different numbers of neutrons. Protons are sub - atomic particles in the nucleus. A compound is a substance made of different elements chemically combined. A mixture is a combination of different substances not chemically combined.

Answer:

B. isotope