the major difference between ground state and excited state is that in ground state, electrons are in possitions of lowest energy possible while in Excited state, electron is in a temporary possition of higher energy than ground state. as it is very unstable so quickly moves to the ground state.
|Ground state||Excited state|
|It is low energy and stable state of an atom.||It is high energy and unstable state of an atom.|
|It has comparatively less number of unpaired electrons.||It has comparatively greater number of unpaired electrons.|