Which of the following pairs are isoelectroni | vedclass

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(A) Isoelectronic species are atoms or ions that have the same number of electrons.For option $A$:$K^{+}$ has $19 - 1 = 18$ electrons.$Cl^{-}$ has $17

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$K^{+}, Cl^{-}$

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(A) Isoelectronic species are atoms or ions that have the same number of electrons.For option $A$:$K^{+}$ has $19 - 1 = 18$ electrons.$Cl^{-}$ has $17 + 1 = 18$ electrons.Since both have $18$ electrons,they are isoelectronic.Electronic configuration of $K^{+}$: $1s^2 2s^2 2p^6 3s^2 3p^6$ ($18$ electrons).Electronic configuration of $Cl^{-}$: $1s^2 2s^2 2p^6 3s^2 3p^6$ ($18$ electrons).

Which of the following pairs are isoelectronic species?

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