Question

Alkaline earth metals form ions of the formula :

• A. $M^{+}$
• B. $M^{-}$
• C. $M^{2+}$
• D. $M^{2-}$

Answer 1

The correct option is C $M^{2+}$

Alkaline earth metals contain 2 electrons in their outermost shell. Hence they lose these 2 electrons to attain noble gas configuration. Hence they form $M^{2+}$ ion.

Therefore, option C is the right answer.