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econf - Electron Configurations There are four ways to...

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Electron Configurations There are four ways to represent an electron configuration. 1. The Orbital (Box) Diagram These show each orbital as a box. The boxes are filled with arrows (representing electrons). The electrons are paired with opposite spin (one arrow pointing up, one arrow pointing down). Example For Carbon NOTE: Hund’s rule says that when orbitals within the same subshell (like 2p, 3d, etc…) are available, you first fill each orbital with ONE electron first. 2. The full electron configuration (a short cut of the orbital diagram) Example Write the full electron configuration for Na 3. The Noble gas shorthand configuration (a short cut of the full configuration) Look at the Noble gas (element in group 8A) that comes BEFORE the element of interest. Example The Noble gas before Na is Ne. Na would be [Ne] 3s 1 (see how the 1s 2 2s 2 2p 6 is substituted for [Ne]?) It’s very convenient! 4. The Distinguishing electron This is simply the subshell containing the last electron listed in the configurations above.
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