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      Question

      The noble gas used in radiotherapy

      is
      A neon Correct Answer Incorrect Answer
      B argon Correct Answer Incorrect Answer
      C radon Correct Answer Incorrect Answer
      D xenon Correct Answer Incorrect Answer

      Solution

      The noble gas which is used in the treatment of cancer is Radon. The atomic number of Radon is 86 and is an element of the 6th period. It is a radioactive, odourless and tasteless noble gas. It is represented by Rn.

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