Answers

2014-02-28T20:21:23+05:30
Atoms is in order of increasing atomic radius : Na, K, Mg, Rb 
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2014-03-01T12:14:01+05:30
As we move down in a group the atomic radii increases so Na<K<Rb are in increasing order of atomic radii but if we move left to right in a group atomic radii decreases so Mg will have the smallest atomic radii as compared to other 3 elements as it belongs to group 2 so the correct answer will be (c) Mg, Na, K, Rb
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