First slide
Periodicity in atomic properties

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


Order of increasing ΔHIE1:Ba<Ca<Se<S<Ar 

Ba<Ca;Se<S: On moving top to bottom in a group, size increases. So ionisation energy decreases. 

Ar has Maximum value of ionisation energy, since it is an inert gas.

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