d and f BLOCK ELEMENTS

Which transition metal series includes elements like Hafnium (Hf), Tantalum (Ta), and Tungsten (W)?

• 3d series
• 4d series
• Lanthanide series
• 5d series

Based on the information, which statement best describes the relationship between electronic configuration and melting point in transition metals?

• Melting points always increase with increasing atomic number.
• Melting points peak only for elements with completely filled d orbitals.
• Melting points generally peak near elements with half-filled d orbitals due to stronger bonding.
• Melting points are unrelated to electronic configuration.

What does the term 'malleability' refer to in the context of transition metals?

• The ability to conduct electricity.
• The ability to be drawn into thin wires.
• The ability to resist corrosion.
• The ability to be hammered or pressed into thin sheets.

Which of the following properties is NOT typically high for transition elements (with exceptions)?

• Tensile strength
• Ductility
• Volatility
• Enthalpy of atomisation

What is the significance of the 'X' symbol used in the lattice structures table for some elements like Mn and Cd?

• It means the element is radioactive.
• It signifies a face-centred cubic structure.
• It indicates the structure is not a standard metallic type or is variable.
• It represents an unknown structure.