CHEM 101 Lecture Notes - Lecture 4: Noble Gas, Valence Electron, Electron Configuration

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Electrons outside of this have no effect on. Nuclear charge increases as the distance between the electron of interest and the nucleus decreases. D has 5 pairs of electrons 10 electrons in each d level. 1s through 2p are the core electrons, 3s and 3 p are the valence. ^^this is called noble gas notation, it"s just shorthand when writing out the electron configurations for elements with many orbital levels electrons (outermost shell) ***note d orbitals are not included in valence electron count. (only s and p levels count for the valence electrons) Transition elements" actual electrons and electron configuration are different from the expected and theoretical. Electrons try to fill/empty the outermost d shell to go into a lower energy state. D is filled even though s is not. Halogens=column 17 (highly reactive because they only need one electron to complete their outer shell. Alkali metals=column 1 (highly reactive because they only need to lose one electron)

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