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The Periodic Table

  • Groups - columns of the periodic table, same number of valence electrons
    • Elements in the same groups will have similar properties
  • Periods - rows of the periodic table, same number of electron shells

Mass Number and Atomic Number

  • Foobarbaz
    • bar is the atomic number
      • number of protons in the nucleus
      • number of electrons in the shells
    • baz is the mass number
      • total number of neutrons and protons in nucleus