| − | A set of electrons with the same azimuthal quantum number. The number of electrons permitted in a subshell is equal to 2 + 1.<ref>http://antoine.frostburg.edu/chem/senese/101/electrons/glossary.shtml</ref> | + | A '''subshell''' is a set of [[electron]]s with the same azimuthal [[quantum number]]. The number of electrons permitted in a subshell is equal to 2''l'' + 1.<ref>http://antoine.frostburg.edu/chem/senese/101/electrons/glossary.shtml</ref> |