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law of conservation of mass
mass is neither created nor destroyed during ordinary chemical reactions or physical changes
law of definite proportions
hemical compound contains the same lements in exactly the same proportions by mass regardless of the size of the sample or source of the compound
law of multiple proportions
if 2 or more differents compounds are composed of the same 2 elements, then the ratio of the masses of the 2nd element combined with a certain mass of the 1st element is always ratio of small whole numbers
short range proton-neutron, proton-proton, and neutron-proton, and neutron-neutron forces hold the nuclear particles together
average atomic unit
weighted average of the atomic masses of the naturally occuring isotopes of an element
amount of substance that contains as many particles as there are atoms in exactly 12 g of carbon-12
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