Question

according to the bohr model of an atom, what happens when an electron moves from the second energy level to the third energy level and then back to the second energy level?
energy is absorbed and then stored in the atom.
energy is released and then absorbed to form an absorption line.
energy is absorbed and then released to form an emission line.
energy is released from the atom, and the outer level is weakened.

Explanation:

According to the Bohr model, when an electron moves from a lower (second) to a higher (third) energy - level, it absorbs energy. When it moves back from the higher to the lower energy - level, it releases energy in the form of a photon, creating an emission line.

Answer:

Energy is absorbed and then released to form an emission line.