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at. wt. abbreviation of "atomic weight," the average weight of one atom of a given element, expressed in atomic mass units.
gram atom the quantity of an element with a weight in grams numerically equal to its atomic weight; gram-atomic weight.
isobar any among two or more atoms that have the same atomic weight but different atomic numbers. (Cf. isotope.) [1/2 definitions]
isomer in physics, one of two or more atomic species that have the same atomic weight and atomic number but different energy levels and half-lives. [1/2 definitions]
isotope any of two or more atoms that have the same number of protons but differ in the number of neutrons, or that have the same atomic number but different atomic weights. (Cf. isobar.)
molecular weight the sum of all the atomic weights of the atoms in a molecule.