Assign reasons for the following:
Ammonia (NH3) has greater affinity for protons than phosphine (PH3).
In PH3 the size of nitrogen is smaller than the size of phosphorus in PH3, hence in NH3 the lone pair of electrons is concentrated on a small region, so its density per atom is more. On other hand phosphours is larger n size and also have vaccant d- orbital it shift electron to d thus lesser avaliable to donation of electron. Due to this reason NH3 has greater affinity towards a proton, i.e. it would be more basic than PH3.
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