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Classification of Elements and Periodicity in Properties
Question
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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

Answer

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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