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Electronegativity

4th period en...

Question

$4^{t h}$ period ends with :

A

argon

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B

neon

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C

krypton

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D

radon

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Solution

The correct option is D krypton
$[A r] 3 d^{10} 4 s^{2} 4 p^{6}$ is the electronic configuration of last element of fourth period. The element is krypton.

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