Homework Answers
In O2- and Al3+
O2- = 1s2 2s2 2p6
Al3+ = 1s2 2s2 2p6
Same electronic configuration but the number of protons in Al is more than the number of protons so net effective attraction in Al is more so Al is small in size.
In Na+ & K+
Na+ = 1s2 2s2 2p6
K+ = 1s2 2s2 2p6 3s2 3p6
Third shell is present in K+ so K+ is larger in size
K+ & O2-
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