Question

what must an electron do to move to a higher energy level?

emit a photon.

gain kinetic energy.

lose energy.

absorb a photon.

Explanation:

Electrons move to higher energy levels by absorbing energy. A photon is a packet of energy. When an electron absorbs a photon with the right amount of energy, it can transition to a higher - energy orbital. Emitting a photon causes an electron to move to a lower energy level. Losing energy is incorrect as it would move to a lower level. Gaining kinetic energy is not the typical way for an electron to move between energy levels in an atom.

Answer:

Absorb a photon.