The general electronic configurations of s-block elements, for alkali and alkaline earth metals respectively are

General electronic configuration of alkali metals is [noble gas] ${\mathrm{ns}}^{\mathrm{l}}$

where, n = l, 2,... 7.

General electronic configuration of alkaline earth metals is

[noble gas] ${\mathrm{ns}}^2$

where, n = 1, 2,... 7