Which oxide of N is isoelectronic with $C O_{2}$ ?

N O_{2}

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N O

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N_{2} O

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N_{2} O_{3}

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Solution

The correct options are
A $N O_{2}$
C $N_{2} O$
D $N_{2} O_{3}$
A series of atoms, ions, and molecules in which each species contains the same number of electrons but the different nuclear charge is called isoelectronic series.

$C O_{2} = 6 + 2 \times 8 = 22$ electrons
$N O_{2} = 7 + 2 \times 8 = 23$ electrons
$N O = 7 + 8 = 15$ electrons
$N_{2} O = 7 \times 2 + 8 = 22$ electrons
$N_{2} O_{3} = 7 \times 2 + 3 \times 8 = 38$ electrons
So $N_{2} O$ is isoelectronic with $C O_{2}$ .

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