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Why does NH3 form hydrogen bond but PH3 ...

Why does `NH_3` form hydrogen bond but `PH_3` does not?

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Hydrogen bond is formed only between the hydrogen and most electronegative elements such as F, O or N. `NH_3` contains electronegative element N but `PH_3` does not contain any electronegative element. Therefore, `PH_3` does not form hydrogen bond.
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