JEE Main Chemistry question

Which among the following elements have lowest value of ?

(A)Pb
(B)SnCorrect
(C)Si
(D)C

Answer: (B)

Solution

Approximate first ionisation energies (kJ/mol): C = 1086, Si = 786, Sn = 709, Pb = 716. Despite being below Sn in the group, Pb's poor shielding by filled - and -subshells

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Question ID VK-133117