d and f BLOCK ELEMENTS

Why is the standard electrode potential for the Zn2+/Zn couple (-0.76 V) negative?

• Zinc is difficult to oxidize
• Zinc has a filled d-subshell
• Zinc readily loses electrons to form Zn2+ ions
• Zinc has a low density

According to Table 4.2, what is the approximate third ionization enthalpy (ΔiH° III) of Titanium (Ti)?

• 2393 kJ mol–1
• 2657 kJ mol–1
• 2833 kJ mol–1
• 1309 kJ mol–1

What is the electronic configuration of the Co3+ ion?

• [Ar] 3d4
• [Ar] 3d5
• [Ar] 3d6
• [Ar] 3d7

Why does Vanadium (V) have a relatively high enthalpy of atomisation?

• It has a small atomic radius
• It has a high density
• Its partially filled d-orbitals contribute effectively to strong metallic bonding
• It has a high ionization enthalpy

Based on Table 4.2, what is the approximate second ionization enthalpy (ΔiH° II) of Iron (Fe)?

• 1509 kJ mol–1
• 1561 kJ mol–1
• 1592 kJ mol–1
• 1644 kJ mol–1