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law of conservation of mass states that mass is neither created nor destroyed during 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 the 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 the small whole numbers
atom the smallest particles of an element that retains the chemical properties of that element
atomic number the number of protons
isotopes atoms of the same element that have the different mass
mass number total number of protons and neutrons
nuclide a general term for specific isotope of an element
average atomic mass the weighted average of the atomic masses of the naturally occurring isotopes of an element
mole amount of a substance that contains as many particles as there are atoms
avogardro's number 6.02 * 10^23
molar mass mass of one mole of a pure substance
Created by: carleyR