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Which of the following group 14 element ...

Which of the following group `14` element has the lowest first ionization enthalpy?

A

`Si`

B

`Ge`

C

`Sn`

D

`Pb`

Text Solution

Verified by Experts

The correct Answer is:
C
The first ionization enthalpy decreases on moving down the group from `C` to `Sn` while there is a slight increase the effect of increased nuclear charge `(82-50=32 units)` outweighs the shielding effect of `4f` and `5d` electrons.
In fact, all other ionization enthalpies of `Pb` are higher than those of `Sn`.
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