. Which of the following has the smallest size
(a) Al3+
(b) F
(c) Na+
(d) Mg2+
Best Answer
Correct Option is: A
Since the given options are isoelectronic, A cation i.e. atom that has lost an electron is always smaller than its parent neutral atom, whereas an anion i.e. atom that has gained an electron is always larger.
Remember this trend in isoelectronic species : Anion > Parent aton > Cation
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