A

David

Darling

shell

electron shells

In atomic physics, a shell is a set of electrons with the same principal quantum number. The number of electrons permitted in a shell is equal to 2n2. A shell contains n2 orbitals, and n subshells.

 


subshell

A subshell is a set of electrons with the same azimuthal quantum number (l). The number of electrons permitted in a subshell is equal to 2l + 1.