First slide

Classical approach of classification of elements

Question

Which of the following represents the electronic configuration of the most electropositive element?

Moderate

A

$[He] 2 s^{1}$
B

$[Xe] 6 s^{1}$
C

$[He] 2 s^{2}$
D

$[Xe] 6 s^{2}$

Solution

Group I elements with ns¹ configuration are more electropositive (EP) than group 2 (ns²) configuration. Moreover EP character increases down the group 1 ( $↓$ ).
So, Cs (6s¹) is the most EP element.

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