keemilise elemendi järjestus (number) keemiliste elementide perioodilises (Mendelejevi) süsteemis; on määratud aatomituuma positiivselt laetud osakeste – prootonite arvuga (võrdne neutraalse elemendi elektronide arvuga) (vt aatom, prooton, elektron)
the order of an element in the periodic (Mendeleyev) chemical classification, and identified with the number of elementary positive charges (protons) within the nucleus of an atom; equal to the number of external electrons in the neutral state of the atom (see: atom, proton, electron)
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