# What is the ion notation for Calcium that lost 2 electrons?

$C {a}^{2 +}$
And thus calcium forms 1:1 salts with doubly negative ions, $C a C {O}_{3}$, $C a S {O}_{4}$, $C a H P {O}_{4}$ etc., and 1:2 salts with negative ions: $C a {I}_{2}$, $C a {\left(N {O}_{3}\right)}_{2}$.