The nitrogen atom has an atomic number $7$ and oxygen has an atomic number $8$
Calculate the total number of electrons in nitrate ion.

8

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16

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32

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24

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Solution

The correct option is D $32$
No.of electrons in $N O_{3}^{-}$ = (Electrons in $N$ )+( $3 \times$ electrons in $O$ )+[ $1$ (due to negative charge)]

= $7$ + $3 \times 8 + 1 = 32$ .

So, the correct answer is 32

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An atom has mass number 23 and atomic number 11. What is the number of electrons in this atom?

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