Which one moves in energy levels: protons, neutrons, or electrons

electrons

Explanation:

Electrons revolve around the nucleus in a fixed circular path termed “orbits” or “shells” or “energy level.”

The region where an electron is most likely to be is called an orbital. Each orbital can have at most two electrons. Some orbitals, called S orbitals, are shaped like spheres, with the nucleus in the center.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.