1. Tardigrade
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  3. Chemistry
  4. Which among the following elements have lowest value of I E1 ?

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Q. Which among the following elements have lowest value of $I E_{1} ?$

Classification of Elements and Periodicity in Properties

Solution:

Ionisation energy of carbon group follows the order :

$C > Si > Ge > Sn < Pb$

$I E_{ Pb }>I E_{ Sn }$ because of poor shielding effect of $d \& f-$ electrons.