d and f BLOCK ELEMENTS

Based on the lattice structure table, which of the following 4d series elements adopts a cubic close-packed (ccp) structure?

• Niobium
• Molybdenum
• Technetium
• Rhodium

What factor primarily contributes to the high thermal conductivity observed in transition metals?

• Large atomic masses
• Low melting points
• Ionic bonding
• The presence of mobile electrons in the metallic lattice

Which of the following elements is classified as a transition element based on its position in the d-block, even though its common oxidation state involves a filled d subshell?

• Zinc
• Cadmium
• Silver
• Aluminum

What is a common characteristic of the enthalpies of atomisation for transition elements, as depicted in Fig. 4.2?

• They decrease steadily across the series.
• They increase steadily across the series.
• They are constant throughout the series.
• They generally reach a maximum value around the middle of each transition series.

Which group of transition elements includes Tungsten (W), Rhenium (Re), and Osmium (Os)?

• 3d series
• 4f series
• 4d series
• 5d series