Question

deduce the formula of the compound that contains 2+ ions and 3- ions that both have the same electron configuration as argon

Answer 1

$\\ \sf\longmapsto [Ar]$

• 2+ means

$\\ \sf\longmapsto [Ar]^{2-}$

• The element will be Calcium

And

$\\ \sf\longmapsto [Ar]^{3+}$

• The element will be Phosphorus