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Q.

Sodium ion is isoelectronic with atom

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a

Mg²⁺

b

Ne

c

N^3–

d

Al³⁺

answer is C.

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Detailed Solution

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The sodium ion is isoelectronic with the neon atom.

Electrons in Na⁺=11−1=10

Electrons in ne= 10

and both Na⁺and Ne have same electronic configuration

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