Demonstrate your understanding of atomic theory and subatomic particles today. We also get to build atoms using a PhET simulation!


  • Understand that atoms of an element may have different masses
  • Write isotope names and symbols
  • Calculate average atomic mass
  • Interpret a mass spectra



  • Complete and turn in 3.02c (Thursday/Friday)
  • Complete and turn in 3.03 (Thursday/Friday)
  • Complete and turn in Reflection #9 (Thursday/Friday)
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