Chemical Species and Formulae

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  • Chemical Species and Formulae
    • Atoms
      • Metal elements are atoms
    • Molecules
      • Non-metal elements/compounds are molecules
      • The formula shows the number of atoms each molecule contains
    • Ions
      • Have a positive or negative charge
      • Always found in ionic compounds
      • Metal elements form positive ions
      • Non-metal elements usually form negative ions
    • Molecular Ions
      • Charged chemical species that contain two or more elements


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