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 ${O^{2-}}$.

$(A)$. $^{24}_{12}Mg$	$(I)$. $5$
$(B)$. $^{27}_{13}Al$	$(II)$. $12$
$(C)$. $^{9}_{4}Be$	$(III)$. $6$
$(D)$. $^{12}_{6}C$	$(IV)$. $14$

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

Similar Questions

Fluoride ion $(F^-)$ is isoelectronic with:

The isobars are atoms with the same number of

Match the isotopes in List $I$ with the number of neutrons in List $II$.
$(A)$. $^{24}_{12}Mg$ $(I)$. $5$
$(B)$. $^{27}_{13}Al$ $(II)$. $12$
$(C)$. $^{9}_{4}Be$ $(III)$. $6$
$(D)$. $^{12}_{6}C$ $(IV)$. $14$

Compared with an atom of atomic weight $12$ and atomic number $6$,the atom of atomic weight $13$ and atomic number $6$:

Which of the following are isoelectronic species?

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