• A chemical reaction involves either electron removal, electron addition, or electron sharing.
  • The path a specific element will take depends on where the electrons are in the atom and how many there are.
  • Valence electrons are the electrons in the highest occupied principal energy level of an atom.
  • The number of valence electrons goes up by one for each step across a period until the last element is reached.
  • Neon, with its configuration ending in s2p6, has eightValence electrons.
  • How many valence electron does boron have?
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