CBSE Class 11-science Answered
Where does the lone pair comes from while drawing the flower stucture of NH3? Why does the one of the two electron does not move in the d-orbital in the exited state of NH3? Can you please explain it with the structures.
Asked by debjyotisaha98 | 12 Sep, 2014, 03:09: PM
Expert Answer
Diagrammatic Representation:
Ammonia molecule
Orbital Overlap:
- Out of the four sp3 hybrid orbitals, one contains a lone pair of electrons and other three are half filled.
- The three half-filled sp3 hybrid orbitals of N atom overlap axially with half-filled 1s orbitals of three hydrogen atoms to form three N- h (sp3-s) sigma covalent bonds.
- In NH3 molecule, there are three bonding pairs of electrons and one lone pair (non-bonding pair) of electrons.
- The forces of repulsion between lone pair and bond pair of electrons decrease in the following order:
- Lone pair-Bond pair > Bond pair- Bond pair
- Due to this, bonding pair of electrons are pushed together and hence H-N-H bond angle is reduced from 109028’ to 107018’.
Nitrogen does not have vacant d-orbitals.
Answered by Arvind Diwale | 14 Sep, 2014, 04:50: PM
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