Name
(b) two elements that have two electrons in their outermost shells.

Magnesium $\left(Mg\right)$ and Calcium $\left(Ca\right)$ have two electrons in their outermost shells.

Element	Electronic configuration	Valence electrons	Group
$Mg\left(12\right)$	$2,8,2$	$2$	$2$
$Ca\left(20\right)$	$2,8,8,2$	$2$	$2$