JEE Main Chemistry question

Which among the following elements has the lowest value of ionisation energy?

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

Answer: (B)

Solution

Ionisation energy generally decreases down group 14 from C to Pb, but lead shows an exception: due to poor shielding from its filled and subshells (and relativistic effects), 's first ionisation energy is actually

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Question ID VK-133547