From the following pairs of ions,which one is | vedclass

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(D) Iso-electronic species are those that have the same number of electrons.$O^{2-}$ has $8 + 2 = 10$ electrons; $F^{-}$ has $9 + 1 = 10$ electrons. (

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$Fe^{2+}, Mn^{2+}$

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(D) Iso-electronic species are those that have the same number of electrons.$O^{2-}$ has $8 + 2 = 10$ electrons; $F^{-}$ has $9 + 1 = 10$ electrons. (Iso-electronic)$Na^{+}$ has $11 - 1 = 10$ electrons; $Mg^{2+}$ has $12 - 2 = 10$ electrons. (Iso-electronic)$Mn^{2+}$ has $25 - 2 = 23$ electrons; $Fe^{3+}$ has $26 - 3 = 23$ electrons. (Iso-electronic)$Fe^{2+}$ has $26 - 2 = 24$ electrons; $Mn^{2+}$ has $25 - 2 = 23$ electrons. (Not iso-electronic)Therefore,the pair $Fe^{2+}, Mn^{2+}$ is not iso-electronic.

From the following pairs of ions,which one is not an iso-electronic pair?

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