Which Subshell Has Higher Energy 4s Or 3d?
Which Subshell Has Higher Energy 4s Or 3d? The 4s subshell is lower in energy than the 3d subshell, so it fills up first. The 4s becomes higher in energy after filling up, so if you ionize the atom, electrons are lost from the 4s subshell before the 3d subshell. Does 4s or 4d have