d and f BLOCK ELEMENTS Quiz

• The stability of the d9 configuration in Cu2+
• The low hydration enthalpy of Cu2+
• The high sum of the first and second ionisation enthalpies of Cu
• Its position at the end of the transition series

• Fe is harder than Cu
• Fe has a lower melting point than Cu
• Fe has a negative E°(Fe2+/Fe) value, while Cu has a positive E°(Cu2+/Cu) value
• Fe forms more stable oxides than Cu

• The exceptional stability of the d4 configuration in Cr2+
• The contribution of higher ionisation enthalpies outweighs the stability of the d5 configuration
• The low hydration enthalpy of Cr2+
• Its position at the start of the transition series

• High electronegativity
• Low ionisation enthalpies
• Small atomic radii
• Availability of (n-1)d electrons for bonding

• It makes the +2 oxidation state more favorable
• It increases the reactivity of Mn metal
• It favors the formation of Mn3+ compounds
• It makes the +3 oxidation state less favorable