NEETChemistryp Block Elements (Group 13 & 14)
What causes the observed discontinuity in ionization enthalpy values between aluminum and gallium?
Options
- AThe presence of d-electrons with high screening effect
- BThe presence of f-electrons with high screening effect
- CThe inability of d-electrons to compensate for the increase in nuclear charge
- DThe inability of f-electrons to compensate for the decrease in nuclear charge
Correct answer
C. The inability of d-electrons to compensate for the increase in nuclear charge
Step-by-step solution
The observed discontinuity in ionization enthalpy values between aluminum and gallium is due to the inability of d-electrons, which have low screening effect, to compensate for the increase in nuclear charge.