Mg2+ ion is smaller than O2- ion although both have same electronic configuration..why??
yes m2+ is ion smaller than that of o2- because
in m2+ 2 e-s are deducted from itz shell where as in o2- 2 e-s are adding in ti d shell
as a result oxygens shells increase leading to in crease in size
where magnesium decreases in size due to deduction of 2 electrons.....:"):")