Write formulas for the following molecules using elemental symbols from Table 2.1 and subscripts. Compare these formulas to those of Exercise 2.1. a) A diatomic molecule of fluorine gas. b) A diatomic molecule of hydrogen chloride (one hydrogen atom and one chlorine atom). c) A triatomic molecule of ozone (a molecular form of the element oxygen). d) A molecule of methane (one carbon atom and four hydrogen atoms).

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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.