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Q.

Which among the following elements have the lowest value of ${IE}_{1} ?$

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a

C

b

Si

c

Pb

d

Sn

answer is B.

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Detailed Solution

The ionization 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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Which among the following elements have the lowest value of IE1?