How many electrons must be lost by an atom of calcium for it

How many electrons must be lost by an atom of calcium for it to obtain a stable electron configuration? 1 2 3 4 5 6 7 8

Solution

Answer:

Two electrons

Explanation:

Calcium has 20 electrons, 2 valence electrons. It\'s stable state would be to have 8 electrons in the outermost shell. It is not possible to obtain to 8 electrons. So, it losses 2 electrons and gets +2 charge. Hence, the calcium will be Ca2+.