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 ${O^{2-}}$.

$(i) \ _{26}Fe^{54}, \ _{26}Fe^{56}, \ _{26}Fe^{58}$	$(a) \ \text{Isotopes}$
$(ii) \ _1H^3, \ _2He^3$	$(b) \ \text{Isotones}$
$(iii) \ _{32}Ge^{76}, \ _{33}As^{77}$	$(c) \ \text{Isoelectronic}$
$(iv) \ _{92}U^{235}, \ _{90}Th^{231}$	$(d) \ \text{Isobars}$
$(v) \ _1H^1, \ _1D^2, \ _1T^3$

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

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