What happens in terms of energy and stability when a covalent bond forms?

Answer 1

I remember my teacher telling me that covalent bonds are stable

Answer 2

You might want to describe what happens by referring to an energy level diagram

http://www.gcsescience.com/rc24-energy-level-diagram.htm

Answer 3

the wander walls force of attraction increases,it become more stable and it requires less energy.