What is the correct order of covalent size of the following ?
Ca ____ Sc

C a = S c

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C a < S c

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C a > S c

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Solution

The correct option is B $C a > S c$
Option (C) is correct.
Covalent size of $C a$ is more than the covalent size of $S c$ .
On moving across the period; the covalent radii and size decreases because the nuclear charge is increased but the shielding effect of added electron (in d orbital) is less effective. This results in greater pull for the valence shell and decrease in the size.

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