states that mass is neither created nor destroyed during ordinary chemical reactions or physical changes
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 a ratio of small whole numbers
the smallest particle of an element that retains the chemical properties of that element
short range proton-neutron, proton-proton, and neutron-neutron forces that hold nuclear particles together
atomic number (Z)
the number of protons of each atom of a element
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