Classification Of Elements And Periodicity In Properties

  • Question
    CBSEENCH11008072

    Which of the following represents the correct order of increasing first ionisation enthalpy for Ca, Ba, S, Se and Ar?

    • Ca <S<Ba<Se<Ar

    • S< Se<Ca<Ba< Ar

    • Ba< Ca<Se< S< Ar

    • Ca<Ba<S<Se<Ar

    Solution

    C.

    Ba< Ca<Se< S< Ar

    Ionisation energy increases along period from left to right and decreases down a group. The position of given elements in the periodic table is as;
    Increasing order of first ionization enthalpy is Ba < Ca < Se < S < Ar

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