• Valence electrons are responsible for the chemical properties of elements.
  • The number of valence electrons can be easily determined from the electron configuration.
  • Electron dot diagrams are diagrams in which the valences electrons of an atom are shown as dots distributed around the element’s symbol.
  • The Table below shows the electron dot diagrams for the entire second period.
  • Most transition elements have twovalence electrons, though some that have unusual electron configurations have only one.
  • The dot diagrams would be the same for each element in the representative element groups.
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