d and f BLOCK ELEMENTS

What is the main chemical property that differentiates transition metals (d-block) from typical s and p-block elements?

• High melting points
• Ability to exhibit variable oxidation states
• Formation of ionic compounds
• Being solids at room temperature

Which of the following is a general trend observed in the d-block elements as the atomic number increases across a period?

• Increase in atomic radius
• Decrease in atomic radius
• No significant change in atomic radius
• Atomic radius first increases then decreases

Which block of elements is characterized by the presence of unpaired electrons in d or f orbitals, leading to magnetic properties?

• s-block
• p-block
• d- and f-blocks
• All blocks equally

What is the primary source of nuclear energy mentioned in the text?

• Lanthanoids
• Transition metals
• S-block elements
• Actinoids

Which of the following elements is a key component in stainless steel and is a d-block element?

• Iron
• Nickel
• Manganese
• Chromium