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  • But not all elements have four valence electrons like carbon. Some of the elements can only offer 1, 2, or 3 valence electrons which create bonds, but this means that there are left over valence electrons that are called lone-pair electrons.
  • An element that only has 3 valence electrons is aluminum. Try an example! And remember the lone pairs
  • AlH?
  • H
  • Al
  • H
  • H
  • Answer: AlH3
  • Elements are organized in columns, which determines how many valence electrons it has. Carbon is in the fourth row, so it has 4 valence electrons and aluminum is in the third column so it has 3 valence electrons.
  • If silicon is in the fourth column, how many valence electrons does it have?
  • 4 valence electrons
  • SiF?
  • That is correct!
  • Now tell me the likely chemical formula of this.
  • SiF4
  • F
  • Si
  • F
  • F
  • Great job! Y'all are experts!
  • F
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