Summary:

  • Metals are good conductors of heat and electricity.
  • Metals are also malleable, which means that they can be hammered into very thin sheets without breaking.
  • Mercury is the only metal to exist as a liquid at room temperature.
  • Mercury switches were once common, but are no longer used.
  • New federally-mandated energy-efficient light bulbs that are now used contain trace amounts of mercury and represent a hazardous waste.
  • The elements in blue in the periodic table below are metals.
  • About 80 percent of the elements are metals and nonmetals.
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