atomic mass
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atomic weightatomnucleusprotonneutronelectronisotopeelementmassweightdaltonamumolar massperiodic tablechemistryphysicsnucleonvalenceorbitalshellquantummoleculecompoundioncationanionstoichiometrymoleavogadro constantatomic numberbinding energystrong forceweak forceelectromagnetismgravitydensityvolumespectrumspectroscopymass spectrometryfractionationabundancemass numberradioactivitydecayhalf lifefissionfusionplasmagasliquidsolidlatticecrystalbondcovalentionicmetallicelectronegativityionization energyelectron affinityperiodicitygroupalkali metalhalogennoble gasmetalloidtransition metallanthanideactinide