Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R ;
Assertion A ; Size of $\mathrm{Bk}^{3+}$ ion is less than $\mathrm{Np}^{3+}$ 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 ;
Select the correct option:
A
A is false but R is true
B
Both A and R are true but R is not the correct explanation of A
C
Both A and R are true and R is the correct explanation of A
D
A is true but R is false
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
Size of ${ }_{97} \mathrm{Bk}^{3+}$ ion is less than that of ${ }_{93} \mathrm{~Np}^{3+}$ due to actinoid contraction. As we know that in a period from left to right ionic radius decreases and in actinide series it is due to actinoid contraction.
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