Trigonal Pyramidal Molecular Geometry, AX3E1

Expected bond angle smaller than 109.5°, lone pair has a larger volume, single bonds will be pushed closer together
Eg NH3, NF3, PH3, ClFO2, ClF2O+,

NH3, Ammonia

LEWIS STRUCTURE COUPER STRUCTURE
CH4 CH4
Electron octet
NH bond length 101.7 pm, HNH bond angle 107.8°
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NF3, Nitrogen trifluoride

LEWIS STRUCTURE COUPER STRUCTURE
CH4 CH4
Electron octet
FNF bond angle 102.5°

The F atoms are more electronegative than H in NH3, the lone pair will be pulled closer to the N and will push the bonds even closer
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PH3, phosphine, (a very poisonous gas) has a HPH bond angle of 93.6°. This bond angle is better explained with valence bonding theory, the large P atom is not hybridized.

ClO2F, Chloryl fluoride

LEWIS STRUCTURE
BrFO3
Expanded octet
When the central atom has a D-orbital and a dativ covalent bond is used to form the electron octet, a double bond is measured in the lab, use then the expanded octet for a final structure
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COUPER STRUCTURE
BrFO3

ClOF2+, Chlorosyl difluoride cation

LEWIS STRUCTURE
BrFO3
Expanded octet
When the central atom has a D-orbital and a dativ covalent bond is used to form the electron octet, a double bond is measured in the lab, use then the expanded octet for a final structure
Show me how
click on videos in the navigation bar of Web-CT


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