Atoms, Compounds and Isotopes

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  • Atoms, Compounds and Istopes
    • The mass number is the total number of protons and neutrons.
    • The atomic number is the total number of protons.
    • Atoms of the same element will have the same number of protons.
    • To get the number of neutrons, just subtract the atomic number from the mass number.
    • Electrons aren't counted in the mass number because their relative mass is very small.
    • Compounds are formed when atoms of two or more elements are chemically combined together.
      • It's difficult to separate the two original compounds out again after they have been mixed.
    • Isotopes are different atomic forms of the same element, which have the same number of protons but a different number of neutrons.
    • Isotopes must have the same atomic number but different. If they had different atomic numbers, they'd be different elements.


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