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The correct arrangement of decreasing or...

The correct arrangement of decreasing order of atomic radius among `Na, K, Mg` and `Rb` is

A

`Rb gt Na gt N gt Mg`

B

`K gt Rb gt Na gt Mg`

C

`Rb gt K gt Na gt Mg`

D

`Mg gt Rb gt K gt Na`

Text Solution

Verified by Experts

The correct Answer is:
C
`Na, K` and `Rb` are of group `1` elements and size increase down the group `1` elements `(darr)`.
`Na` and `Mg` are of group `1` and `2` elements respectively but both belong to `3rd` period. Along the period size decreases `(rarr)`, i.e. size of `Na gt Mg`.
Hence the order of sizes is
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