A) lanthenoid contraction
B) greater screening effect
C) inert pair effect
D) none of the above
Correct Answer: B
Solution :
The atomic radius of \[Al=143\,\,r/pm\] is\[135\,\,r/pm\]. The radius of \[Ga\] is less than \[Al\] due to greater screening effect in \[Al\] (It has 8 electrons in the penultimate shell).
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