Ccording to the Bohr model of the atom, when an electron goes from a higher-energy orbit to a lower-energy orbit, it electromagnetic energy with an energy that is equal to the between the two orbits.

1. Absorbs electromagnetic energy

2. Energy difference between the two orbits.

Explanation:

Bohr precisely describe the processes of absorption and emission of energy in terms of electronic structure. According to Bohr's model, an electron would absorb energy in the form of photons to get excited to a higher energy level as long as the photon's energy was equal to the energy difference between the initial and final energy levels. After jumping to the higher energy level or the excited state, the excited electron would be in a less stable position, so it would quickly emit a photon to relax back to a lower, more stable energy level.

c. electrical charges of ionic bonds.