give reason bond angle in Nh3 is 107° 28' instead 109° 28'
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The organisation of electron pairs are ruled by the VSEPR (Valence Shell Electron Pair Repulsion) . In a structure of 3 pairs of electrons like BF3 it is 120°because the maximum distantance between the electrons pair are a flat triangular structure so 360°/3 →120°
Because Nitrogen has a free electron pair, it corresponds to a 3 dimensional structure close to the tetrahedron:
It should be 109.5° (Perfect tetrahedron) but the non bonding pair of electron occupy more space so it is 107°.
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