Explain why inspite of nearly the same electronegativity, nitrogen forms hydrogen bonding while chlorine does not.

Explanation

Both nitrogen (N) and chlorine (Cl) have electronegativity of 3.0. However, only nitrogen is involved in the hydrogen bonds (e.g., `NH_(3)`) and not chlorine. This is an account of smaller atomic size of nitrogen (atomic radius =70 ppm) as compared to chlorine (atomic radius =99 pm). Therefore, N can cause greater polarisation of N-H bond than Cl in case of Cl-H bond. Consequently, N atom is involved in hydrogen bonding and not chlorine.