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      Question

      Which alkali metal is represented by the atomic number

      3?
      A Sodium Correct Answer Incorrect Answer
      B Lithium Correct Answer Incorrect Answer
      C Rubidium Correct Answer Incorrect Answer
      D Cesium Correct Answer Incorrect Answer

      Solution

      Lithium, represented by the atomic number 3, is the lightest of all metals and plays significant roles both in industrial applications and psychiatric medication.

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