d and f BLOCK ELEMENTS

What is the main structural feature that defines an interstitial compound?

• Large atoms replace metal atoms
• Small atoms are trapped within the crystal lattice of a metal
• Only hydrogen atoms are involved
• Metal atoms are arranged in layers

How does the variable oxidation state of transition metals contribute to their catalytic effectiveness?

• It makes them more stable
• It prevents them from reacting
• It makes them ionic
• They can act as intermediate electron acceptors/donors, facilitating redox reactions

What is the primary source of the catalytic activity of transition metals according to the provided text?

• Their high melting points
• Their large atomic masses
• Their ability to adopt multiple oxidation states and form complexes
• Their ionic nature

Which of the following best describes the electron configuration aspect that allows transition metals to form complexes?

• Completely filled s-orbitals
• Empty p-orbitals only
• High electronegativity
• Partially filled or available d-orbitals

What is the main reason the text gives for the high melting points of alloys formed by transition metals?

• They are less dense
• They contain weaker bonds
• They are purely covalent
• The formation of strong metallic bonds and often complex structures