AIEEE 2009 Solved Paper

In periodic table Li,Na,Mg,Be are present in following ways :-

Group 1	Group 2
Li	Be
Na	Mg

Note:
(1) In periodic table from left to right the size of element decreases.
(2) In periodic table, from top to bottom size of element increases.
So, Be+2 will be the smallest in size.
Among Li+and Na+, size of Na+>Li+and among Be+2 and Mg+2, size of Mg+2>Be+2
So, the correct order will be, Na+>Li+>Mg+2>Be+2