Đơn chất gồm: O2 ,Fe, H2, Mg, Br2
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Hợp chất gồm: KMnO4, KNO3, BaCl2, NaON, Ca(NCO3),
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Fe(OH)2, Fe(OH)3, BaSO4, Fe2(SO4),
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*) Trong đó các đơn chất: O2 có nguyên tố oxygen
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Fe có nguyên tố Iron
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H2 có nguyên tố hydrogen
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Mg có nguyên tố Magnesium
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Br2 có nguyên tố bromine
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*) KMnO4 gồm 3 nguyên tố: potassium, manganese, oxygen
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KNO3 gồm 3 nguyên tố: potassium, nitrogen, oxygen
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BaCl2 gồm 2 nguyên tố: barium, chlorine
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NaON gồm 2 nguyên tố: sodium, oxygen, nitrogen
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Ca(NCO3) gồm 4 nguyên tố: calcium, nitrogen,
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carbon, oxygen
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Fe(OH)2 gồm 3 nguyên tố: Iron, oxygen, hydrogen
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Fe(OH)3 gồm 3 nguyên tố: Iron, oxygen, hydrogen
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BaSO4 gồm 3 nguyên tố: barium, solfur, oxygen
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Fe2(SO4) gồm 3 nguyên tố: Iron, solfur, oxygen
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