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

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

NTA AbhyasNTA Abhyas 2022

Solution:

On moving left to right ionization energy increases as size decreases and on moving top to bottom in a group, size increases. So ionization energy decreases.
Hence, order of increasing first ionization enthalpy i.e., $\Delta H_{I E_{1}}$ is Ba < Ca < Se < S < Ar