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- #Classification of Elements and Periodicity in Properties
- #Chemistry
- #NCERT
- #Chemistry Part I Textbook for Class XI
- #CBSE 11 Class
3.19 The first ionization enthalpy values (in ) of group 13 elements are :
B Al Ga In Tl
801 577 579 558 589
How would you explain this deviation from the general trend ?
Answers (1)
The given trend can be explained by the following steps:
(i) Moving from B to Al, there is an increase in the size of the atom as a result decrease in the value of ionization enthalpy.
(ii) Moving from Al to Ga, there are 10 electrons in Ga which do not screen as is done by Sulphur and Phosphorus. Therefore, there is an unexpected increase in the value of effective nuclear charge resulting in increased ionization energy value.
(iii) Moving from Ga to In and Tl, there are 14 electrons in Tl with very poor shielding effect, which increases the effective nuclear charge thus the value of ionization energy increases.
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