One atom of lithium, Li, reacts with fluorine, F, to produce lithium fluoride, LiF2. The atomic mass of lithium is 7 amu. The mass of one atom of lithium fluoride is 45 amu. Which statement about the reaction is correct? Lithium reacts with two atoms of fluorine, and the atomic mass of fluorine is 38 amu.   Lithium reacts with two atoms of fluorine, and the atomic mass of fluorine is 19 amu.   Lithium reacts with one atom of fluorine, and the atomic mass of fluorine is 38 amu.   Lithium reacts with one atom of fluorine, and the atomic mass of fluorine is 19 amu.

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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.