erineva massiarvu kuid sama prootonite arvuga nukliidid. Prootonite arv määrab ära elemendi keemilised omadused, seega keemilise elemendi erinevatel isotoopidel on samad keemilised omadused. Elemendi üks isotoop on stabiilne, teised ebastabiilsed ehk radioisotoobid.
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