Science Fair Projects Ideas - AXE method (chemistry)

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AXE method (chemistry)

In chemistry, The AXE method is commonly used in formatting molecules to fit the VSEPR model that aims to explain molecular geometry.

The A represents the central atom and is always (implied) subscript one. The X represents how many bonds are formed between the central atoms and outside atoms. Multiple covalent bonds (double, triple, etc) count as one X. The E represents the number of lone electron pairs present outside of the central atom. Once the AXE formula has been found, the following table will predict the geometric configuration around the central atom.

Molecular Geometries
TypeShape
AX2E0Linear
AX2E1Bent
AX2E2Bent
AX2E3Linear
AX3E0Trigonal planar
AX3E1Trigonal Pyramidal
AX3E2T-shaped
AX4E0Tetrahedral
AX4E1Seesaw
AX4E2Square Planar
AX5E0Triangular Bipyramidal
AX5E1Square Pyramidal
AX6E0Octahedral
Last updated: 05-08-2005 08:50:03
10-26-2009 08:16:03
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