Final answer:
NH3 molecule takes on a trigonal pyramidal shape due to the lone pair on the nitrogen atom, influencing its geometry.
Explanation:
NH3 molecule takes on a trigonal pyramidal shape despite the tetrahedral orientation of its electron groups, due to the lone pair of electrons on the nitrogen atom. This shape is determined by the positions of atoms in the molecule.
The nitrogen atom in NH3 is surrounded by three N-H bonds and one lone pair, leading to a pyramidal molecular structure. The deviation in bond angles is caused by the lone pair occupying more space than the bonds.
The geometry of NH3 illustrates the influence of lone pairs on molecular shape, important in understanding structure and properties of compounds.
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