Question

Which of the following ions would represent the most common ion of an element from group 2A?

A.) A2+

B.) X2-

C.) Y3+

D.) Z+

Answer 1

The ion that would represent the most common ion of an element from group 2A is A 2+

explanation

Group 2A are group of elements in periodic table which are known as alkaline earth metals.

Example of group 2A elements is magnesium and calcium.

Group 2A has 2 valence electron in their outer most shell and therefore they form ion which is positively charged by loses the 2 valence electrons.

for example magnesium (Mg) which has 2.8.2 or [Ne] 3S2 electron configuration loses the 2 valence electron to form Mg2+ ion. Therefore A2+ ion represent the common ion of group 2A element.