What happenes when an election moves to a higher energy level?

Do you mean electron, if an electron moves to higher energy level then it has low electronegative and its hard for that element to lose an electron. Atomic radius increases

The electrons in an atom exist in various energy levels. When an electron moves from a lower energy level to a higher energy level, energy is absorbed by the atom. When an electron moves from a higher to a lower energy level, energy is released (often as light).

oxygen +1 most likely