Classification of Elements and Periodicity in Properties

Classification of Elements and Periodicity in Properties

Question

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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