●hydrogen, - H, ●oxygen, - O, ● nitrogen, - N, ● carbon, - C, ● magnesium, - mg, ● copper - cu, ● zinc, - zn, ● aluminium, - Al, ● iron, - Fe, ● chlorine - , Cl, ● helium, - He., magnesium oxide, - MgO, ● hydrogen, - H2, ● oxygen, - O2., copper oxide, - CuO, ● carbon dioxide, - CO2, ● calcium carbonate, - CaCO3, ● copper carbonate, - CuCO3, ● calcium chloride, - CaCl2, ● copper chloride - , CuCl2,

elements

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