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7.1: ions

7.1: ions. Valence electrons. Valence means value So... Valence electrons are the only ones that matter, or have value…. Lewis dot structures. They represent the valence e - ONLY Go from East to West, then North to South, then fill up counter-clockwise .

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7.1: ions

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  1. 7.1: ions

  2. Valence electrons • Valence means value • So... Valence electrons are the only ones that matter, or have value…

  3. Lewis dot structures • They represent the valence e-ONLY • Go from East to West, then North to South, then fill up counter-clockwise. • Normally, the e- are centered at their locations as we draw them in. They are offset here just so you can see the filling pattern. 3 X 1 2

  4. The octet rule Man, I cannot WAIT to have an octet of these metal arm things! • Octo = 8 • Everyone is trying to look like a noble gas (with a full octet) • Metals tend to lose their valence e- • Non-metals tend to jack or share valence e-

  5. Ionization, cation/ion formation, Losing/getting valence e- • CATION formation = losing valence e- • C A + ION “See a positive ion” • We will keep the element name when referring to cation elements • Calcium atom; Ca Calcium Ion; Ca2+ • ANION formation = getting valence e- • “ANegative ION” • We will CHANGE the name when referring to anion elements • (usually with –ide) • Chlorine atom; Cl Chloride Ion; Cl-

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