11th Class Chemistry Classification of Elements and Periodicity in Properties

  • question_answer 28) What are the factors due to which ionisation enthalpy of the main group elements tends to decrease down the group?

    Answer:

    The following factors decrease the ionisation enthalpy in the elements of the main group from top to bottom: (i) Atomic size: Atomic size increases due to addition of a new energy shell. This decreases force of attraction towards nucleus and consequently, ionisation enthalpy decreases. (ii) Screening effect: Due to increase of inner electrons, the shielding effect increases which reduces force of attraction towards nucleus and hence, ionisation enthalpy decreases.

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