Compare the radii of two species X and Y.


Compare the radii of two species X and Y. Give reasons for your answer.

(a) X has 12 protons and 12 electrons

(b) Y has 12 protons and 10 electrons


The available information makes it clear that :

(a) Species X with equal number of protons (12) and electrons (12) is an atom.

(b) Species Y with two electrons less (10) than the number of protons (12), is a divalent cation y2+ of species X.

Therefore, the radius of species X is more as compared to that of y2+.

Note : The radius of cation is always less than that of atom while that of anion is more.

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