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The symbols of the elements and subscripts are used to represent a molecule of an element or a compound.

N2, O2, H2, Cl2, Br2, I2, F2, At2 are diatomic molecules of the element in each formula.

C6H12O6, NO2, H2O, CO2 are examples of molecular compounds.

NaCl, MgSO4, CaCl2 are examples of ionic compounds.

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