The mathematical description of the undulatory behavior of electron orbitals in atoms is shortly reviewed. Orbitals are formulated as spatial wave functions, mathematical solutions of the Schroedinger equation, which are eigenfunctions of spatial operators describing energy and angular momentum of the atom's electron orbit. On this basis, wave and radial functions of the hydrogen-like atom are described and plotted in a simplified manner using Matlab® surf and fsurf functions. A simplified representation of hybrid orbitals is also discussed and plotted. Some elements of wave functions theory and the Schroedinger equation are recalled in Appendix F (Chapter 16).
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