Question

Mg2+ ion and O2- ions are isoelectronic in structure. Are they similar in
size? If not, why?
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Answer 1

Answer:

In Mg2+ and O2- ion, the no. of electrons is same, but in Mg, protons are more as compared to O2-, and hence app;y more force on electrons and because no. of electrons is already less in Mg2+, electrons cannot compensate with the force and are attracted by protons and size becomes smaller.