• A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance.
  • Physical properties of matter include color, hardness, malleability, solubility, electrical conductivity, density, melting points, and boiling points.
  • The vast majority of elements are colorless, silver, or gray.
  • Some elements do have distinctive colors: sulfur and chlorine are yellow, copper is (of course) copper-colored, and elemental bromine is red.
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