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Explain: The geometry of NH_(3) molecule is trigonal pyramidal. |
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Answer» Solution :This reason is explain by `sp^(3)` hybridization of N in `NH_(3)` and VSEPR theory. In `NH_(3)` the VALENCE shell (outer) electronic CONFIGURATION of Nitrogen in the ground state is `2s^(2)2p_(x)^(1) 2p_(x)^(1) 2p_(z)^(1)` having three unpaired electrons in the sp hybrid orbitals and alone pair of electrons is present in the fourth one. This three hybrid orbitals overlap with is orbitals of hydrogen atoms to FORM three N - H sigma bonds. And one non bonding electron pair containing `sp^(3)` orbital is REMAINING. The force of repulsion between a lone pair and a bond pair is more than the force of repulsion between two bond pair electrons. The molecular thus gets distorted and the bond angle is reduced to `107^(@)` from `109.5^(@)`. The geometry of such a MOLECULES will be pyramidal. 
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