Electron Configuration
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  • 1. Use the periodic table in your agenda to fill in the chart. Element Metal, Nonmetal, or Metalloid? Neon (Ne) Sodium (Na) Chlorine (Cl) Silicon (Si) Calcium (Ca) Gold (Au) Arsenic (As) Nonmetal Metal Nonmetal Metalloid Metal Metal Metalloid
  • 2. ReviewReview Metals Nonmetals Metalloids
  • 3. Electron ConfigurationElectron Configuration Electrons orbit around the nucleus Form a “cloud” around the nucleus The “cloud” has “layers” “Layers” = energy shells
  • 4. Energy LevelsEnergy Levels  First shell is closest to the nucleus  Holds up to 2 electrons  The second shell holds up to 8 electrons
  • 5. Energy LevelsEnergy Levels The third shell holds up to 18 electrons There are more than 3 shells
  • 6. Energy LevelsEnergy Levels No. of shells depends on the no. of electrons Each shell must be full before a new one forms The Period Number tells you how many energy shells an atom has
  • 7. Valence Electron(s)Valence Electron(s) Electron(s) in the outer most shell of an atom The Group Number tells you the number of valence electron(s)
  • 8. Valence Electron(s)Valence Electron(s) Group 1, 1 valence electron Group 13? 3 Determines an elements reactivity
  • 9. Octet RuleOctet Rule Elements need 8 valence electrons to be stable Or their outer shell is full
  • 10. Argon Atom 8 valence electrons = stable Outer shell is full = stable