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There is considerable increase in covale...

There is considerable increase in covalent radius from N to P. However, from Sb to Bi only small increase (of 7 pm) in covalent radius is observed. This is due to

A

poor shielding by completely filled d-and f-orbitals in Bi

B

similar electronegativity of Sb and Bi

C

the Bi being last element of the group

D

similar densities of Sb and Bi

Text Solution

Verified by Experts

The correct Answer is:
A
Poor shielding by `f-` and d-electrons enhences the effective nuclear charge in Bi. This causes contraction in size.
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