d and f BLOCK ELEMENTS

What is the primary reason for the decrease in ionic radius across a transition metal series?

• Effective shielding by d electrons
• Poor shielding by d electrons and increasing nuclear charge
• Decreasing nuclear charge
• Increasing number of electron shells

Which factor is NOT mentioned as influencing the enthalpy of atomisation in transition metals?

• Number of valence electrons
• Series of the element (first, second, third)
• Electronegativity
• Boiling point

What is a general characteristic of the atomic radii trend from the first (3d) to the second (4d) series?

• Atomic radii decrease
• Atomic radii remain the same
• Atomic radii increase
• Atomic radii fluctuate randomly

Which type of electrons provides the poorest shielding effect according to the trends described?

• s electrons
• p electrons
• d electrons
• f electrons

How does the variation in atomic/ionic radii within a single transition metal series compare to the variation between different series?

• Variation within a series is very large
• Variation within a series is quite small
• Variation is the same in all cases
• It depends on the specific element