Question

Mg2+ ion is smaller than 0 2 - ion although both have same electronic configuration.Why?

Answer 1

Explanation:

Mg2+ ion is smaller than 0 2 - ion but both have same electronic configuration.Mg+²'s nuclear charge is+12 and O2 's nuclear charge +8

so,with increased in nuclear charge the size decreases.so, Mg2+ ion is smaller than 0 2 - ion

I hope you can understand the answer

Answer 2

Answer:

They are isoelectronic species and therefore the cation will have higher nuclear charge and so will be smaller