Which one has the same electron configuration as a neon atom ?

N a^{+}

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^{-}

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Solution

The correct option is B $N a^{+}$
Sodium-ion $N a^{+}$ has the same electron configuration as a neon atom.

Both are isoelectronic species with 10 electrons and the electronic configuration $1 s^{2} 2 s^{2} 2 p^{6}$

Sodium has electronic configuration $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$ .

It loses one electron to give $N a^{+}$ ion with electronic configuration of $N e .$

Hence, the correct option is A.

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