The correct arrangement of decreasing or...

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

A

MgltKltNaltRb

B

MgltNaltKltRb

C

MGltNaltRbltK

D

NaltKltRbltMg

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The correct Answer is:

B

Atomic radius decreases along the period and incraeses down the group. MgltNaltKltPb

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