Atoms, Compounds and Isotopes

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  • Atoms, Compound and Isotopes
    • Atomic number and mass number describe an atom
      • THE MASS NUMBER- at the top of the letter
        • Total number of protons and neutrons
      • THE ATOMIC NUMBER- at the bottom of the letter
        • The number of protons
      • 1) Different elements will have different numbers of protons
      • 2) To get the number of neutrons, just take away the atomic number from the mass number
      • 3) Electrons aren't counted in the mass number because their relative mass is very small
      • Table needed
    • Compounds are chemically combined
      • 1) Compounds are made when atoms of two or more elements are chemically combined together
      • E.G carbon is a compound, its made from a chemical reaction between carbon and oxygen
    • Isotopes are the same except for the number of neutrons
      • ISOTOPES ARE: atoms of the same element, which have the same number of protons but a different number of neutrons
      • 1) If they had different numbers of protons, they'd be different elements
      • 2) Carbon-12 and Carbon-14 are two isotopes of carbon
      • Carbon-12  6 protons, 6 electrons, 6 neutrons
      • Carbon-12: 6 Protons, 6 electrons, 8 Neutrons

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