d and f BLOCK ELEMENTS

What is a key factor contributing to the frequent metal-metal bonding in compounds of heavy transition metals?

• Lower atomic masses
• Higher enthalpies of atomisation
• Lower electronegativities
• Smaller atomic radii

How does the text explain the stability of metals with high enthalpies of atomisation?

• They have low melting points
• High energy required to break bonds contributes to stability
• They readily form compounds
• They have low density

Which transition metal series is associated with the Lanthanoid contraction?

• First (3d) series
• Second (4d) series
• Third (5d) series
• All series equally

What is the effect of adding an electron to a d orbital on the shielding of outer electrons?

• It provides excellent shielding
• It provides moderate shielding
• It provides poor shielding
• It has no effect on shielding

Why is the decrease in radius across a transition series relatively small despite the increase in nuclear charge?

• Because the nuclear charge remains constant
• Because the added d electrons provide some shielding, even if it's not very effective
• Because electrons are removed from the outer shell
• Because the number of electron shells increases