Assertion Reason on Covalent Radius Trend | JEE Main Periodic Properties

Assertion Reason on Covalent Radius Trend

Assertion (A):
There is a considerable increase in covalent radius from N to P. However from As to Bi only a small increase in covalent radius is observed.

Reason (R):
Covalent and ionic radii in a particular oxidation state increases down the group.

(A) (A) is false but (R) is true
(B) Both (A) and (R) are true and (R) is the correct explanation of (A)
(C) Both (A) and (R) are true but (R) is not the correct explanation of (A)
(D) (A) is true but (R) is false

Correct Answer: Both (A) and (R) are true but (R) is not the correct explanation of (A)

Explanation

Assertion (A) is true because from As to Bi, poor shielding by d and f electrons reduces the expected increase in covalent radius.

Reason (R) is a general statement and is true, but it does not explain the anomaly observed from As to Bi.

Hence, both statements are true but Reason (R) is not the correct explanation of Assertion (A).

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