d and f BLOCK ELEMENTS Quiz

• 3d electrons provide worse shielding for 4s electrons
• 3d electrons provide better shielding for 4s electrons than electrons in the same outer shell
• 3d electrons have no effect on 4s electrons
• 3d electrons completely shield 4s electrons from the nuclear charge

• There is an inverse correlation; more unpaired electrons lead to lower enthalpies of atomisation
• There is no correlation
• There is a direct correlation; more unpaired electrons generally lead to higher enthalpies of atomisation
• The relationship depends on the specific element

• Transition elements have fewer electrons
• The ns electrons are farther from the nucleus and less tightly held than the np electrons of the next group
• Transition elements have larger atomic radii
• The nuclear charge is lower in transition elements

• Decrease in atomic radius
• Formation of ions with particularly stable d5 configurations
• Increase in nuclear charge
• Decrease in shielding effect

• Transition elements have fewer protons
• Electrons in the same shell shield each other more effectively than electrons in different shells
• The nuclear charge decreases
• Transition elements have larger atomic radii