Q.

Sodium ion is isoelectronic with---------atom

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a

Mg2+

b

Al3+

c

Ne

d

N3–

answer is C.

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Detailed Solution

Na+ ion has ten electrons. Al+3, Mg+2, Ne and N-3 contain ten electrons each but Al+3, Mg+2, and N-3 are ions, Neon is the only neutral atom which is isoelectronic with Na+ ion.
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