Home Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) General There is considerable increase in covalent r…
Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) General Single Correct MCQ
Published on: August 13, 2026

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 eletronegativity of Sb and Bi.
C
the Bi being last element of the group.
D
similar densities of Sb and Bi.

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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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