First slide

Atomic number, mass number, isotopes, isobars and isotones

Question

Which one of the following constitutes a group of the isoelectronic species?

Easy

A

$C_{2}^{2 -}, O_{2}^{-}, CO, NO$
B

${CN}^{-}, N_{2}, O_{2}^{2 -}, C_{2}^{2 -}$
C

$N_{2}, O_{2}^{-}, {NO}^{+}, CO$
D

${NO}^{+}, C_{2}^{2 -}, {CN}^{-}, N_{2}$

Solution

${NO}^{+}, C_{2}^{2 -}, {CN}^{-}, N_{2} . . . . 14 electrons$

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