Drah kimia nakeuh dat kimia nyang teususôn nibak atôm-atôm nyang na jeumeulah proton nyang saban lam inti atômjih.[1] Sampoë 'an jinoë ka na 118 boh drah nyang ka jiteumèë, nyakni 94 boh drah na alami lam bumoë salang 24 boh drah teuk nakeuh drah nyang geupeugöt.[2]
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