Question

    Which of the following is a noble gas

    ?
    A Krypton Correct Answer Incorrect Answer
    B Astatine Correct Answer Incorrect Answer
    C Fluorine Correct Answer Incorrect Answer
    D Chlorine Correct Answer Incorrect Answer

    Solution

    Krypton is a noble gas in the above options given. Noble gases are also known as inert gases as their outermost shell is fully filled and therefore their reactivity is very low. All other gases are halogens. Other noble gases are helium, neon, argon, krypton, xenon and radon. Hence, option A is correct.

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