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Chapter 2 Chemistry of Life practice test questions correctly defined a+ guaranteed atom - n Ans the smallest unit of matter that cannot be broken down by chemical means (contains a nucleus with protons and neutrons and an electron cloud) Qs subatomic particles - n Ans protons, neutrons, and electrons Qs element - n Ans a pure substance made of only one kind of atom and represented by a symbol such as H for hydrogen Qs compound - n Ans substances made up of two ...