Engineering
Chemistry
Ionisation Energy
Question

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

S < Se < Ca < Ba < Ar

Ca < S < Ba < Se < Ar

Ca < Ba < S < Se < Ar

Ba < Ca < Se < S < Ar

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Solution

Among Ca, Ba, S, Se , Ar

Ba has minimum Ionisation energy and Ar has highest ionisation energy

Ba < Ca < Se < S < Ar