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Question

Which of the following atoms has minimum covalent radius

A
C
B
B
C
N
D
Si
Solution
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Correct option is C. N
As we move along a period radius decreases and as we move down the group, radius increases.
Hence, $$B(5)>C(6)>N(7)$$.
Also,
($$r^n$$ ∝ $$\dfrac{1}{Z}$$ along a period).

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