Assume you have a pure sample of chemical element. Based on the characteristics below, what properties would you observe or would you experiment with to try to find out what element it is and what its place would be on the periodic table? a) a block with metallic luster. b) a brittle piece that crumbles. c) an unreactive gas. d) a very reactive and toxic

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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.