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

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

  • Option 1)

    Ca < Ba < S < Se < Ar

  • Option 2)

    Ca < S < Ba < Se < Ar

  • Option 3)

    S < Se < Ca < Ba < Ar

  • Option 4)

    Ba < Ca < Se < S < Ar

 
Answers (2)
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K Kamal

How

As we have learned

Variation of IE along the period -

Along the period (→) the nuclear charge (Z) increases and atomic radii decrease although shell remains the same.Due to these opposing factors, the outer most electrons are more strongly held by the nucleus. So more energy is required to remove the electron. Hence I.Eincreases along the period (→). 

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Variation of I.E. down the group -

Down the group, the atomic size increases gradually, consequently the force of attraction between the nucleus and outermost electron decreases and hence I.E. should decrease.

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Ionisation energy increases along period from left to right and decreases down the group


Option 1)

Ca < Ba < S < Se < Ar

Option 2)

Ca < S < Ba < Se < Ar

Option 3)

S < Se < Ca < Ba < Ar

Option 4)

Ba < Ca < Se < S < Ar

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