Get Answers to all your Questions

header-bg qa

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)

best_answer

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 (→). 

-

 

 

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.

-

 

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

Posted by

Plabita

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

How

Posted by

Kamal

View full answer