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mass is not created or destroyed during ordinary chemical reactions or physical changes Law of Conservation of Mass
compounds contain the same elements in the same proportions by mass regardless of the size of the sample or source of the compound Law of Definite Proportions
when 2 or more different compounds are made of the same 2 elements, the ratio of the masses of the 2nd element combined with a certain mass of the 1st element is always a ratio of small whole numbers Law of Multiple Proportions
smallest part of an element that retains all the properties of that element atom
short-range proton-neutron, proton-proton, and neutron-neutron forces that hold the nuclear particles together nuclear forces
1/12 the mass of a carbon-12 atom atomic mass unit, amu
the number of p+ in the nucleus of each atom of that element atomic number
average of all the atomic masses of the naturally-occurring isotopes of an element average atomic mass
the # of particles in exactly 1 mole of a pure substance Avogadro's number
atoms of the same element that have different masses isotopes
total number of p+ plus no in the nucleus of an isotope mass number
mass of 1 mole of a pure substance molar mass
amount of a substance that has as many particles as there are atoms in exactly 12g of carbon-12 mole
general term that refers to any isotope of any element nuclide
Created by: CRMissK