What is the electron domain geometry of ammonia?

What is the electron domain geometry of ammonia?

• Correct Answer: tetrahedral
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Explanation: Another example of sp 3 hybridization occurs in the ammonia (NH 3 ) molecule. The electron domain geometry of ammonia is also tetrahedral, meaning that there are four groups of electrons around the central nitrogen atom. Unlike methane, however, one of those electron groups is a lone pair. The resulting molecular geometry is trigonal pyramidal. Just as in the carbon atom, the hybridization process starts as a promotion of a 2s electron to a 2p orbital, followed by hybridization to form a set of four sp 3 hybrids. In this case, one of the hybrid orbitals already contains a pair of electrons, leaving only three half-filled orbitals available to form covalent bonds with three hydrogen atoms.

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