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      Question

      Which is the lightest and most abundant chemical

      element, constituting roughly 75 % of the Universe’s elemental mass?
      A Carbon Correct Answer Incorrect Answer
      B Aluminium Correct Answer Incorrect Answer
      C Bauxite Correct Answer Incorrect Answer
      D Hydrogen Correct Answer Incorrect Answer

      Solution

      The lightest and most abundant chemical element in the Universe is hydrogen. It constitutes about 75% of the elemental mass in the Universe. Hydrogen is also the first element in the periodic table, with the atomic number 1. It is a highly reactive element, and it can form a wide variety of compounds with other elements.

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