A) due to d contraction in Pb and Bi
B) due to relativistic contraction of the 6s orbitals of Pb and Bi, leading to inert pair effect
C) due to screening effect
D) due to attainment of noble liquid configuration
Correct Answer: B
Solution :
\[_{82}Pb=...6{{s}^{2}}6{{p}^{2}}\] \[_{83}Bi=...6{{s}^{2}}6{{p}^{3}}\] Due to inertness of \[6{{s}^{2}}\] electrons in Pb and Bi, they show bivalency and trivalency respectively instead of tetra and pentavalency.
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