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Which of the following is the lightest metal ?

  • A.Silver
  • B.Lithium
  • C.Lead
  • D.Mercury

Answer: B

Lithium is the lightest metal, with a density of 0.53 g/cm³ - about half that of water, so it floats.

It is also the lightest solid element of any kind. Its low weight and high electrochemical potential are what make lithium-ion batteries so effective.

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