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Mass is neither created nor destroyed during ordinary chemical reactions or physical changes
Law of definite proportions
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
The interaction that binds protons and neutrons, protons and protons, and neutrons and neutrons together in a nucleus
The number of protons of each atom of that element
Atoms of the same element that have different masses
A general term for a specific isotope of an element
Atomic Mass Unit
Exactly 1/12 the mass of a carbon-12 atom
Average Atomic Mass
The weighted average of the atomic masses of the naturally occurring isotopes of an element
6.02 * 10^23
The number of particles in exactly 1 mol of a pure substance