CAS CH 102 Chapter Notes - Chapter 3: Julius Lothar Meyer, Dmitri Mendeleev, Electron Configuration
11 Nov 2016
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Chapter 3: elements, atoms, ions, and the periodic table. The number of valance electrons is the group number. The period number gives the energy level (n) of the valance shell. Let"s look at an atom of fluorine as an example. Fluorine has 7 electrons in the n=2 level: the quantum mechanical atom. Debroglie (french physicist) determined that electrons not only are particles, but they have a wave nature as well. Heisenburg uncertainty principle - cannot know the location and the momentum of an electron in an atom. Erwin schr denger - developed equations that took into account the particle nature and the wave nature of the electrons: schr denger equations: Equations that determine the probability of finding an electron in a specific region in space. Give us principle energy levels (n = 1,2,3 ) Sublevels or subshells (s, p, d, f) and. Orbitals (odd number by subshell): principle energy levels.
