Which one of the following is not isoelectron | vedclass

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(C) Isoelectronic species are those that have the same number of electrons.The oxygen anion ${O^{2-}}$ has $8 + 2 = 10$ electrons.Checking the options

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${Tl^{+}}$

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(C) Isoelectronic species are those that have the same number of electrons.The oxygen anion ${O^{2-}}$ has $8 + 2 = 10$ electrons.Checking the options:$1$. ${N^{3-}}$ has $7 + 3 = 10$ electrons.$2$. ${F^{-}}$ has $9 + 1 = 10$ electrons.$3$. ${Na^{+}}$ has $11 - 1 = 10$ electrons.$4$. ${Tl^{+}}$ (Thallium ion) has an atomic number of $81$,so ${Tl^{+}}$ has $81 - 1 = 80$ electrons.Therefore,${Tl^{+}}$ is not isoelectronic with ${O^{2-}}$.

Which one of the following is not isoelectronic with ${O^{2-}}$?

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