H (hydrogen), Na (sodium), K (potassium), Mg (magnesium), Ca (calcium), Cr (chromium), Mn (manganese), Fe (iron), Co (cobalt), Au (gold), Ag (silver), Hg (mercury), U (uranium), Al (aluminium), Pb (lead), Sn (tin), Si (silicon), C (carbon), N (nitrogen), P (phosphorus), S (sulphur), O (oxygen), F (fluorine), Cl (chlorine), I (iodine), As (arsenic), Cu (copper).

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