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mass per unit volume of a substance. The number of molecules in a particular area or a measure of the compactness of a substance.
(amu) is equal to 1/12 of the mass of the 12C atom.
four shared electrons, or two shared pairs of electrons (or two covalent bonds) between the same...
a chemical reaction where two molecules combine to form one single molecule. The elimination of...
a substance that improves the efficiency of a catalyst is called a promoter.
light nuclei join together to form heavier nuclei.