Question 3.18 What are the various factors due to which the ionization enthalpy of the main group elements tends to decrease down a group?
Class XI Classification of Elements and Periodicity in Properties Page 93
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Ionisation enthalpy of the main group elements decreases regularly on moving down the group due to following factors :
(1) atomic size :- when we move down the group , atomic size increases due to addition of new higher energy shell . as a result of this force of attraction of nucleus for valance electrons decreases and hence, Ionisation enthalpy also decreases.
(ii) screening effect :- on moving down the group , screening effect increases due to this force of attraction between nucleus and electron decreases . as a result of this Ionisation enthalpy decreases.
(1) atomic size :- when we move down the group , atomic size increases due to addition of new higher energy shell . as a result of this force of attraction of nucleus for valance electrons decreases and hence, Ionisation enthalpy also decreases.
(ii) screening effect :- on moving down the group , screening effect increases due to this force of attraction between nucleus and electron decreases . as a result of this Ionisation enthalpy decreases.
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Answer:
(i) Atomic size:- When we move down the group, atomic size increases due to addition of new higher energy shell. As a result of this force of attraction of nucleus for valance electrons decreases and hence, Ionisation enthalpy also decreases.
(ii) Screening effect:- On moving down the group, screening effect increases due to this force of attraction between nucleus and electron decreases. As a result of this Ionisation enthalpy decreases.
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