Question

the bond angle of NH3 is more than PS3 and NF3?
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Answer 1

Answer:

Both NH3 and NF3 form pyramidal shape. But the angle between these molecules differ due to the electronegativity difference between them. The electronegativity of Nitrogen is more than that of H , therefore the bond cloud tries to attract to the nitrogen atom. Therefore the whole electron cloud attract to the central atom. Then the each electron pair come closer to the each and due to this electron tries to repel each other. This leads to increase in the bond angle of NH3 but in NF3 the bond pairs attract to the Fluorine atom, (terminal atoms). The distance b/w electron pairs increase and hence, repulsion decreases. So, NF3 has smaller bond angle.

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