d and f BLOCK ELEMENTS

What is the electronic configuration of a Cr2+ ion?

• [Ar] 3d2
• [Ar] 3d3
• [Ar] 3d4
• [Ar] 3d5

Why does the imperfect shielding in transition elements lead to a general increase in ionization enthalpy across a series?

• Atomic radius increases
• Electron-electron repulsion decreases
• Effective nuclear charge increases
• Number of protons decreases

Based on Table 4.2, what is the approximate density of Copper (Cu)?

• 8.7 g cm–3
• 8.9 g cm–3
• 7.8 g cm–3
• 7.1 g cm–3

What is the electronic configuration of a neutral Manganese (Mn) atom?

• [Ar] 3d4 4s2
• [Ar] 3d5 4s2
• [Ar] 3d6 4s2
• [Ar] 3d7 4s2

According to Table 4.2, which element has a standard electrode potential (E°) for the M3+/M2+ couple that is strongly positive?

• Iron (Fe)
• Manganese (Mn)
• Cobalt (Co)
• Vanadium (V)