Question

When a group IIA atom forms an ion, what charge does it have?

• A. 2
• B. -2
• C. 3
• D. -3
• E. None. It is neutral.

Answer 1

The correct option is A 2

$IIA$ elements are alkaline earth metals, which have 2 electrons in valence shell, and being metal these are electropositive, hence, these can loose two electrons to obtain noble gas electronic configuration.
$Ca\to C{a}^{2+}+2e^{-}$.
So, the $IIA$ elements have $+2$ charge.