d and f BLOCK ELEMENTS

Which property is NOT directly mentioned as being influenced by the enthalpy of atomisation in the text?

• Standard electrode potential
• Boiling point
• Melting point
• Noble character in reactions

What is the significance of the statement 'the variation within a series is quite small' for transition metal atomic/ionic radii?

• It means all elements in a series have identical radii
• It indicates that changes in radius across a series are modest despite other changing factors
• It suggests that nuclear charge remains constant
• It implies that d electrons provide excellent shielding

Which orbital filling sequence is directly responsible for the Lanthanoid contraction?

• Filling of 5d orbitals before 4f orbitals
• Filling of 4f orbitals before 5d orbitals
• Filling of 3d orbitals before 4f orbitals
• Filling of 4p orbitals before 4f orbitals

What is the effect of the Lanthanoid contraction on the atomic radii of 5d series elements compared to 4d series elements?

• The radii of 5d elements become much larger than 4d elements
• The radii of 5d elements become much smaller than 4d elements
• The radii of 5d elements become nearly equal to 4d elements
• The radii follow no predictable pattern

Why do transition metals with many valence electrons have high enthalpies of atomisation?

• Weaker interatomic forces
• Stronger resultant bonding requires more energy to break
• Lower boiling points
• Decreased stability