d and f BLOCK ELEMENTS Quiz

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

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

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

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

• 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