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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