Why does NH_{3} form hydrogen bond but PH_{3} | vedclass

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(B) Hydrogen bonding occurs when hydrogen is covalently bonded to a highly electronegative atom like $N$,$O$,or $F$. Nitrogen $(N)$ has a high electro

Vedclass · Accepted Answer

Due to the high electronegativity and small size of $N$ atom.

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(B) Hydrogen bonding occurs when hydrogen is covalently bonded to a highly electronegative atom like $N$,$O$,or $F$. Nitrogen $(N)$ has a high electronegativity $(3.04)$ and a small atomic size,which allows it to polarize the $N-H$ bond significantly,leading to strong hydrogen bonding in $NH_{3}$. In contrast,phosphorus $(P)$ has a much lower electronegativity $(2.19)$,which is similar to that of hydrogen. Therefore,the $P-H$ bond is not sufficiently polarized to form hydrogen bonds in $PH_{3}$.

Why does $NH_{3}$ form hydrogen bond but $PH_{3}$ does not?

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