What happens to energy when a chemical bond forms and what happens to energy when a chemical bond is broken?

During formation of bond,the atoms come close,then their are two possibilities

1. The force of attraction between electron of one atom and the nucleus of the other atom and the electron of the other atom attracts the nucleus of the another atom.This attractive forces lowers the potential energy of the two atoms and their are chances of bond formation.

2.There are also repulsive forces between nucleus-nucleus and electron-electron,which increases the potential energy.

But as the attractive forces are dominant over the repulsive forces,therefore atoms come close and lower the energy of atoms forming bond....

During the formation of bond the potential energy of the atoms decreased.