Chemistry-
General
Easy
Question
Which among the following elements have lowest value of 
- (a) Pb
- Sn
- (c) Si
- C
The correct answer is: Sn
The ionisation energy of tin {Sn} is less than that of lead (Pb). It is due to the poor shielding of d- and f-electron in Pb due to which it feels greater attraction from nucleus.
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