Among the following, the isoelectronic specie | vedclass

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(D) Isoelectronic species are atoms or ions that have the same number of electrons.For $(I)$: $O^{2-} (8+2=10)$, $F^{-} (9+1=10)$, $Na^{+} (11-1=10)$,

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$(I)$ and $(III)$

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(D) Isoelectronic species are atoms or ions that have the same number of electrons.For $(I)$: $O^{2-} (8+2=10)$, $F^{-} (9+1=10)$, $Na^{+} (11-1=10)$, $Mg^{2+} (12-2=10)$. All have $10$ electrons, so $(I)$ is isoelectronic.For $(II)$: $Na^{+} (10)$, $Mg^{+} (11)$, $Al^{3+} (10)$, $F^{-} (10)$. Since $Mg^{+}$ has $11$ electrons, $(II)$ is not isoelectronic.For $(III)$: $N^{3-} (7+3=10)$, $O^{2-} (8+2=10)$, $F^{-} (9+1=10)$, $Ne (10)$. All have $10$ electrons, so $(III)$ is isoelectronic.Therefore, $(I)$ and $(III)$ are isoelectronic species.

Among the following, the isoelectronic species is/are:
$(I)$ $O^{2-}, F^{-}, Na^{+}, Mg^{2+}$
$(II)$ $Na^{+}, Mg^{+}, Al^{3+}, F^{-}$
$(III)$ $N^{3-}, O^{2-}, F^{-}, Ne$

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Among the following, the isoelectronic species is/are:$(I)$ $O^{2-}, F^{-}, Na^{+}, Mg^{2+}$$(II)$ $Na^{+}, Mg^{+}, Al^{3+}, F^{-}$$(III)$ $N^{3-}, O^{2-}, F^{-}, Ne$