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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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