Q.

The order of magnitude of ionic radii of ions Na+,Mg2+,Al3+ and Si4+ is

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a

Na+

b

Mg2+>Na+>Al3+>Si4+

c

Al3+>Na+>Si4+>Mg2+

d

Na+>Mg2+>Al3+>Si4+

answer is D.

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Detailed Solution

Na+>Mg2+>Al3+>Si4+ All are isoelectronic but  nuclear charge per electron is greatest for Si4+ So ithas smallest size and nuclear charge per electron for Na+ is smallest. So it has largest size.
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