Question

the atomic radius of a nitrogen atom is 71 pm. what is the distance between the nuclei of two bonded nitrogen atoms in a n2 molecule?
a 35 pm
b 70 pm
c 142 pm
d 212 pm

Explanation:

Step1: Recall atomic - radius concept

The distance between the nuclei of two bonded atoms of the same element in a molecule is equal to twice the atomic radius of a single atom.

Step2: Calculate the distance

Given the atomic radius of a nitrogen atom $r = 71$ pm. The distance $d$ between the nuclei of two bonded nitrogen atoms in $N_2$ is $d = 2r$. Substitute $r = 71$ pm into the formula: $d=2\times71$ pm.
$d = 142$ pm

Answer:

C. 142 pm