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Why does NH(3) form hydrogen bond but PH...

Why does `NH_(3)` form hydrogen bond but `PH_(3)` does not?

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For the formation of `H-` bond the essential condition are (i) small size (ii) high electronegativity. Electronegativity values : N = 3.0, P = 2.1, H = 2.1, Nitrogen and hydrogen have a considerable difference in their electronegativity values so they form covalent bond having polar nature. That is why H - bonding exists among `NH_(3)` molecular.
Phosphorus and hydrogen have equal values of electronegativity, that.s why covalent bond `P-H` is non - polar. Therefore, H - bonding does not occur among `PH_(3)` molecule.
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