Question

an electron in an atom can move from one energy level to another when * 1 poin the nucleus creates enough energy to project the electron outward. the nucleus reacts. the atom gains or loses energy. the atom is destroyed.

Explanation:

To determine the correct answer, we analyze each option:

• The first option is incorrect because the nucleus does not "project" electrons outward; electrons' energy level changes are related to energy absorption/emission, not the nucleus projecting them.
• The second option is incorrect as the nucleus reacting (like in nuclear reactions) is not related to electron energy level transitions in an atom.
• The third option is correct. Electrons move between energy levels when the atom gains (electron moves to a higher energy level) or loses (electron moves to a lower energy level) energy, usually in the form of photons.
• The fourth option is incorrect because the atom being destroyed is not a normal process for electron energy level transitions; electron transitions happen within a stable (or undergoing normal changes) atom.

Answer:

C. the atom gains or loses energy.