Arrange the following in increasing orde...

Arrange the following in increasing order of their atomic radius: Na, K, Mg, Rb

A

`Mg lt K lt Na lt Rb`

B

`Mg lt Na lt K lt Rb`

C

`Mg lt Na lt Rb lt K`

D

`Na lt K lt Rb lt Mg`

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The correct Answer is:

B

In a period from left to right atomic radius decreases.

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