Question

Arrange the following in the order of increasing size
Mg2+ , Al3+, Na+ , O2​

Answer 1

O2 < Na+ = Al3+ = Mg2+

Because Na+,Al3+ and Mg2+ contain same number of electrons i.e, 10 electrons.

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Answer 2

Al+3< Mg+2< Na+< O2
Size is inversely proportional to +ve charge