Valence electrons

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Valence electrons

  1. 1. ValenceElectrons: ELECTRONS AVAILABLE FOR BONDING
  2. 2. CA Standards Students know how to use the periodic table to determine the number of electrons available for bonding. Students know how to draw Lewis dot structures.
  3. 3. DefinitionValence electrons are electrons in the outmost shell (energy level). They are the electrons available for bonding.
  4. 4. Group 1 (alkali metals) have 1valence electron
  5. 5. Group 2 (alkaline earth metals)have 2 valence electrons
  6. 6. Group 13 elements have 3valence electrons
  7. 7. Group 14 elements have 4valence electrons
  8. 8. Group 15 elements have 5valence electrons
  9. 9. Group 16 elements have 6valence electrons
  10. 10. Group 17 (halogens) have 7valence electrons
  11. 11. Group 18 (Noble gases) have 8valence electrons, excepthelium, which has only 2
  12. 12. Transition metals (“d” block)have 1 or 2 valence electrons
  13. 13. Lanthanides and actinides(“f” block) have 1 or 2 valenceelectrons
  14. 14. Dot NotationsAn atom’s valence electrons can be representedby Lewis dot notations. 1 valence e- 2 valence e- 3 valence e- 4 valence e- X X X X 5 valence e- 6 valence e- 7 valence e- 8 valence e- X X X X
  15. 15. Dot Notations – Period 2Lewis dot notations for the valence electrons ofthe elements of Period 2. lithium beryllium boron carbon Li Be B C nitrogen oxygen fluorine neon N O F Ne

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