1999/09/24 by Joel M. Williams, Williams, Joel M.
Chemistry · Physics and Astronomy · #FOS: Physical sciences #General Physics (physics.gen-ph) #History and advancements in chemistry #physics.gen-ph
paper · pdf · doi:10.48550/arxiv.physics/9909053
61 pages with figures in 41gif files
openalex publication_date 1999/09/24 · arxiv created 2000/01/03 · arxiv updated 2009/12/01 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
The MCAS Way extends the MCAS concept of atomic orbitals to molecular bonding. There are many examples given for each bonding type. Part I: The MCAS atomic orbital concept. There are no spherical orbitals and spin pairing does not occur through spin reversal. Quantum numbers do not validate coexistence in identical space. Part II: Single bonds. There are no sigma-bonds wherein two electrons occupy identical space on a line between nuclei; only off-axis (Xi) bonding. Covalent bonding is purely electrostatic; just like ionic bonding. Part III: Triple bonds. There are no Pi-bonds in a triple bond. Part IV: Simple double bonds. There are no sigma bonds; only Pi| and Pi_ bonds. Part V: Multiple bonds. The traditional Pi-cloud is only a group of reciprocating, vertically pumping, electron pistons. Electrons conjugate by flowing around nuclei in the nuclear plane. Atoms adopt a twelve-lobed (T12) orbital arrangement for multiple bonding. Aromaticity is defined by 2(2n+1), not (4n+2). Part VI: Miscellaneous compounds. Isoelectronic XO3, phosphorous and its oxides, and boranes.