L-shell

In atomic physics, the L-shell is the second electron shell surrounding the nucleus of an atom. It can hold up to eight electrons. Electrons in the L-shell have higher energy levels than those in the K-shell (the innermost shell) and lower energy levels than those in the M-shell (the third shell). The L-shell is also referred to as the n=2 shell, where n represents the principal quantum number. The filling of the L-shell follows Hund's rule, and is crucial in determining the chemical properties of an element. The binding energy of L-shell electrons varies depending on the element.