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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.)
periodic law the principle that the properties of the chemical elements recur periodically when the elements are arranged in increasing order of their atomic numbers.
periodic table a table that illustrates the periodic system of the chemical elements, classified according to atomic number.
transuranic having an atomic number higher than that of uranium.