Electron Distribution in Different Shells

Stage 4,5

Electrons are arranged by energy levels or the shell around the nucleus. The shell closest to the nucleus has the least energy. Electrons first occupy the smallest shell and occupy the next shell in the order of energy increase, given the maximum number of electrons that can fit into any energy level with 2n squared, where n is the energy series, such as 1, 2, 3, and 4.