Question

The total number of valence electrons in 4.2 grams of nitride ion is:

• A. $1.4N_0$
• B. $2.4N_0$
• C. $3.2N_0$
• D. $4.2N_0$

Answer 1

Answer: (B)

$2.4N_0$

No. of valence electrons in one nitride $N^{3-}$ ion $=8$

No. of valence electrons in 4.2g of Nitride ion $=\frac{Weight}{AtomicWeight}\times 8\times N_o$

No. of valence electrons in 4.2g of Nitride ion $=\frac{Weight}{AtomicWeight}\times 8\times N_o$

$=\frac{4.2}{14}\times 8\times N_o$

$=2.4\times N_o$

Hence, the correct option is $\text{B}$