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law of conservation of mass
matter is neither created or destroyed during ordinary chemical reactions or physical change.
law of definite proportions
the fact that a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound.
law of multiple proportions
If two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always the ratio of small whole numbers.
gold foil experiment to show volume of nucleus was very small compared to the atom itself.
Average atomic mass
weighted average of the atomic masses of the naturally occuring isotopes of an element.
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