NTA Abhyas NEET2020Chemistryp Block Elements (Group 13 & 14)Practice
The increasing order of atomic radii of the following Group 13 elements is
Options
- AAl < Ga < In < Tl
- BGa < Al < In < Tl
- CAl < In < Ga < Tl
- DAl < Ga < Tl < In
Correct answer
B. Ga < Al < In < Tl
Step-by-step solution
As on moving down the group atomic size increase so Ga < Al < In < Tl. Here size of Ga is less than that of Al due to poor screening effect in Ga.