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Question

Among Na+,Na,Mg and Mg2+, the largest particle is:

A
Mg2+
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B
Mg
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C
Na
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D
Na+
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Solution

The correct option is C Na
If we move from left to right along a period in the periodic table, size of the elements decrease because effective nuclear charge increases from left to right along a period.So size of Na is bigger than Mg.
Now size of any ion is smaller than it's parent element.So Na has larger size than Na+ and Mg has larger size than Mg2+.
So decreasing order of size follows as Na>Mg>Na+>Mg2+.
For information size of each species are given bellow:
Na=154 pm Na+= 116 pm, Mg=130 Mg2+ = 86 Pm.

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