A) 10 d-electrons which have a large exchange energy
B) 10 d-electrons which have a large radius ratio
C) 10 d-electrons which shield the nuclear charge strongly
D) 10 d-electrons which shield the nuclear charge poorly
Correct Answer: D
Solution :
Zn, Cd and Hg have smaller ionic radii than group elements due to former involve 10 d-electror which have poor shielding effect so that electror are more strongly attracted towards nucleus.
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