Abstract
While the periodic table of elements is well founded in its arrangement based on atomic number and elemental chemistry, the assumption that is validates the spdf/nlms quantum model is wrong. The inability of the model to properly place Hydrogen is a major deficiency. The spdf/nlms models piles electron density on top of electron density with increasingly more complex orbital shapes – orthogonality hardly obeyed although greatly touted. These problems and concerns about hybridization of orbitals and chemical reactions led me to the MCAS electron orbital model. This essay demonstrates that the MCAS model serves as the appropriate, atom- electron orbital system that configures the periodic table, provides optimal electron-orbital spatial distribution, and explains the emission spectra of the elements.
Joel M Williams