NH3 molecule. Intensity is proportional to
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NH3 molecule structure
Isolated N atom has 5 electrons in 4 orbitals
2s ↑↓ 2px ↑
2py ↑ 2pz ↑
After hybridization we get
sp 3↑↓ sp 3↑
sp 3↑ sp 3↑
Three last electrons make bonds with three H atoms.
Hybridized orbital is also used to hold non-bonding (lone pair painted in
Valence bond theoryupdated 9 Apr 2012