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  • Which of the following has least ionisation energy?Option: 1 Si Option: 2 Ge

Which of the following has least ionisation energy?

Option: 1

Si 


Option: 2

Ge 


Option: 3

Sn 


Option: 4

Pb 


Answers (1)

best_answer

As we have learnt,

Ionisation energy of carbon family decreases down the group but Pb has more I.E. than Sn. This is because of the poor shielding of the f electrons.

Order of ionisation energy 

\mathrm{C > Si > Ge >Pb >Sn }

Therefore, option (3) is correct.

Posted by

Kuldeep Maurya

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