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The p-Block Elements
Accounts for the following:
NH3 is stronger base than PH3.
Nitrogen is the smallest member in group. Hence the lone pair of electron on nitrogen can be easily donated. On the other hand Phosphorus is bigger size than nitrogen and therefore the, lone pair of electron is not readily available for donation. More readily a species donate an electron pair, more basic it is. Thus NH3 is stronger base than PH3
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