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Please help! Which of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F, O?

Which of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F, O?

  • Option 1)

    Ca < Al < C < O < F

  • Option 2)

    Al < Ca < O < C < F

  • Option 3)

    Al < O < C < Ca < F

  • Option 4)

    C < F < O < Al < Ca

 
Answers (1)
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As learnt in

Variation of electron gain enthalpy in periodic table -

  1. Electron gain enthalpy decreases down the group.
  2. generally, electron gains enthalpy increases (more negative) along the period. 

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 Electron gain enthalpy increases along the period as the attraction between incoming electron and the nucleus increases.

Also, it decreases down the group due to increased atomic size.

\therefore   Increasing order of electron gain enthalpy:

        Ca < Al < C < O < F


Option 1)

Ca < Al < C < O < F

This option is correct

Option 2)

Al < Ca < O < C < F

This option is incorrect

Option 3)

Al < O < C < Ca < F

This option is incorrect

Option 4)

C < F < O < Al < Ca

This option is incorrect

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