CHEM 101 Lecture Notes - Lecture 7: Molar Mass, Electron Shell, Electron Configuration
15 Sep 2016
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Determination of formula of a hydrated salt o. Ratio n = number of water per molecule. Mass of h2o = mass before - mass after. Electron shells: roughly correlate to the distance that an electron is from an atom"s nucleus o. Contains electrons that have approximately the same energy and spend most of their time approximately the same distance from the nucleus. Electrons that occupy the electron shell are closer to the nucleus and have a lower energy than electrons in the second electron shell. Electron subshells: each principle energy level (n) is divided into n sublevels. Electron orbitals: regions in space that represent a high probability of locating an electron. Each sublevel has one or more orbitals o o. Orbitals within the same subshell differ in orientation. It spins on its own axis in either a clockwise or counterclockwise direction o. When two electrons are present in an orbital, they always have opposite spins.
