Question

Find the number of an element(s) which is/are present in group-II.
$Ba,K,Ca,Cs,Rb,Na$

Answer 1

$Ba$ and $Ca$ are present in group IIA. Other members of this group include $Be,Mg,Sr$ and $Ra$.
$K,Cs,Rb$ and $Na$ belongs to group IA. Other group IA elements include $Li$$.