The small increase in the covalent radii from $\mathrm{Si}$ to $\mathrm{Pb}$ is due to the presence of

half-filled $d$-orbitals in heavier members

presence of completely filled $d$-orbitals in lighter members

JEE CHEMISTRY MCQ: 14 TH GROUP ELEMENTS (P-BLOCK)

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The small increase in the covalent radii from

\mathrm{Si}

\mathrm{Pb}

is due to the presence of

View answer and explanation

Correct option: B

completely filled

d

and

f

-orbitals in heavier members

Option B is correct because the presence of completely filled d and f orbitals in heavier members causes poor shielding, leading to a smaller increase in covalent radii than expected.

JEE CHEMISTRY MCQ: 14 TH GROUP ELEMENTS (P-BLOCK)

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