Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: Size of Bk ion is less than Np ion. Reason R: The above is a consequence of the lantha

Question

Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: Size of Bk ion is less than Np ion. Reason R: The above is a consequence of the lanthanoid contraction. In the light of the above statements, choose the correct answer from the options given below: 3+ 3+ 3+ 3+ 3+

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

Prashant Kotian · Accepted Answer

Correct answer: D) BOTH A AND R ARE TRUE AND R IS THE CORRECT EXPLANATION OF A. For actinoids, the ionic radii for M (according to data available) gradually decrease due to actinoid contraction as the number of 5f electrons increase. This is because the extra charge on the nucleus is poorly shielded by the f-electrons. Bk = 98 pm Np = 101 pm

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