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The p-Block Elements

Long Answer Type

611. Discuss the anamolous behaviour of fluorine among the halogens. Give reason also.

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612. Discuss the general characteristics of Group 15 elements with reference to their electronic configuration, oxidation state, atomic size, ionization enthalpy and electronegativity.

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Short Answer Type

613. 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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