Question

Account for the difference in size of Na+ (0.095nm) and Mg2+ (0.065nm)
both of which have the same noble gas configuration.​

Answer 1

Answer:

though both have same number of electrons but there are different number of protons present in them. Sodium have 11 protons and magnesium have 12 protons in there respective nucleus which means electron in magnesium will feel strong nuclear charge due to presence of more number of protons, hence its size will be small.