1.

Among Na^(+) Na, Mg and Mg^(2+), the largest particle

Answer»

`Mg^(2+)`
Na
Mg
`Na^(+)`.

Solution : As we MOVE from left to right across a PERIOD, there is regular decrease in atomic radii of the REPRESENTATIVE elements. Thus Na is LARGER in size than Mg.
The ionic radii of a cation is always LESS than the atomic radii of that very atom.
`underset(1.54 Å)(Na) underset(0.95A)( Na^(+)) underset(1.36A)(Mg) underset(0.65A)(Mg^(2+))`


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