Valence electrons

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  • 1. ValenceElectrons: ELECTRONS AVAILABLE FOR BONDING
  • 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. DefinitionValence electrons are electrons in the outmost shell (energy level). They are the electrons available for bonding.
  • 4. Group 1 (alkali metals) have 1valence electron
  • 5. Group 2 (alkaline earth metals)have 2 valence electrons
  • 6. Group 13 elements have 3valence electrons
  • 7. Group 14 elements have 4valence electrons
  • 8. Group 15 elements have 5valence electrons
  • 9. Group 16 elements have 6valence electrons
  • 10. Group 17 (halogens) have 7valence electrons
  • 11. Group 18 (Noble gases) have 8valence electrons, excepthelium, which has only 2
  • 12. Transition metals (“d” block)have 1 or 2 valence electrons
  • 13. Lanthanides and actinides(“f” block) have 1 or 2 valenceelectrons
  • 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. 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