The Periodic Table

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Groups

  • Elements with similar properties form columns
  • Verticle columns are called groups
  • Elements in a group have the same number of electrons on the outer shell
  • The elements in group 0/8 are noble gases - stable and unreactive
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Reading the Periodic Table

  • The top number is the mass number - total number of protons and neutrons
  • The bottom number is the atomic number - number of protons=number of electrons

To find the number of neutons subtract atomic number from mass number

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