First slide

Periodicity in atomic properties

Question

Which is isoelectronic with ${CN}^{-}$

Easy

A

$CO$
B

${N_{2}}^{⊤}$
C

${N_{2}}^{-}$
D

$O_{2}^{+}$

Solution

Number of electrons in $C N^{-} = 14$
Number of electrons in $C O = 14$
Number of electrons in $N_{2}^{+} = 13$
Number of electrons in $N_{2}^{-} = 15$
Number of electrons in $O_{2}^{+} = 15$

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