atomic weight
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atomelementisotopeprotonneutronelectronnucleusmassmolar massdaltonamuperiodic tablechemistryphysicsvalenceorbitalshellnucleonatomic numbermass numbermoleavogadro constantstoichiometryabundancefractionaverageweighted averagespectroscopymass spectrometryioncationanionmoleculemolecular weightdensityquantumenergybinding energyradioactivitydecayhalf lifestableunstablehydrogenheliumcarbonoxygennitrogengoldleaduraniumplutoniummetalnonmetalmetalloidhalogennoble gasalkali metalalkaline earth metaltransition metallanthanideactinideelectronegativityionization energyaffinitylatticecrystalplasmagasliquidsolid