NEETChemistryp Block Elements (Group 13 & 14)
Why does a deviation in atomic radius occur between gallium and aluminum?
Options
- ADue to a decrease in the number of electrons.
- BDue to a decrease in nuclear charge.
- CDue to poor screening effect from additional d-electrons.
- DDue to the presence of additional 10 f-electrons.
Correct answer
C. Due to poor screening effect from additional d-electrons.
Step-by-step solution
The deviation in atomic radius between gallium and aluminum occurs because the presence of additional 10 d-electrons offers only poor screening effect for the outer electrons from the increased nuclear charge in gallium.