Question

How many electrons does calcium have to give up in order to achieve noble-gas electron configuration?

A. 5

B. 4

C. 2

D. 3

E. 1

Answer 1

It's in group IIA, so it has 2 valent electrons in its outermost shell, to fill it up it would either need to accept 6 new electrons or donate the 2 electrons it already has.

It does the latter because of its metal character.