d and f BLOCK ELEMENTS

Which of the following elements is explicitly mentioned as an exception when discussing the typical hardness and volatility of transition elements?

• Iron
• Chromium
• Titanium
• Zinc

Based on the text's description of melting points, which 4d transition metal would you expect to have a relatively high melting point near the middle of its series?

• Niobium
• Technetium
• Ruthenium
• Molybdenum

What structural information is provided about Iron (Fe) in the table?

• It adopts only a hexagonal close-packed (hcp) structure.
• It adopts only a body-centred cubic (bcc) structure.
• It adopts only a cubic close-packed (ccp) structure.
• It can adopt either a body-centred cubic (bcc) or a cubic close-packed (ccp) structure.

Why is the property 'metallic lustre' considered a typical characteristic of transition elements?

• Because they are all grey in colour.
• Because they are magnetic.
• Because they react readily with oxygen.
• Because it results from the interaction of light with the sea of delocalized electrons in the metal.

Which transition metal series contains elements like Yttrium (Y), Zirconium (Zr), and Niobium (Nb)?

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