Among the following, the isoelectronic species is/are :
(i) $O^{2 -}, F^{-}, N a^{+}, M g^{2 +}$
(ii) $N a^{+}, M g^{+}, A l^{3 +}, F^{-}$
(iii) $N^{3 -}, O^{2 -}, F^{-}, N e$

(i) & (ii)

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(i), (ii) & (iii)

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(ii) & (iii)

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(i) & (iii)

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Solution

The correct option is B (i) & (iii)
The isoelectronic species are (i) & (iii).
Each atom/ion has 10 electrons.
Isoelectronic species are species with same number of electrons.
Hence, the option (D) is the correct answer.

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i) N e i i) O^{2 -} i i i) M g^{2 +} i v) F

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F^{-}, O^{2 -}, N a^{+}, M g^{2 +}

i) N e i i) O^{2 -} i i i) M g^{2 +} i v) F

v) A l^{3 +} v i) C l^{-} v i i) K v i i i) N a

N^{3 -}, O^{2 -}, F^{-}, {N a}^{+}, {M g}^{2 +}

{M g}^{2 +}, O^{2 -} {A l}^{3 +}; N^{3 -}, F^{-}, {N a}^{+}

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