Nomer atom iku angka kang nuduhaké cacahing proton sajeroning inti atom. Sacara tradisi, nomer atom dilambangaké nganggo simbol Z. Amarga nomer atom saben unsur kimia iku unik, nomer atom dianggo ngidhèntifikasi unsur kimia. Upamané angka atom hidrogen iku 1 (siji) - tegesé Hidrogen duwé proton siji.
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