N2 + O2 → H2O + HNO3 Pa+ O2 P2O5 NANO3 NaNO2 + O2 C3Hs + O2 CO2 + H20 Fe+ H2O H2 + Fe3O4 Zn + CuSO,-ZNSO,+ Cu

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.