Q. Which element behaves chemically both as metal and non-metal?
Answer: Boron
Notes: Some elements behave chemically both as metals and nonmetals, and are called metalloids. There are total eight of them such as Boron, Silicon, Germanium and Antimony. Most of these elements are used in doping of semiconductors. Elements which are neither metals nor non-metals are called Noble or Inert Gases.

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