d and f BLOCK ELEMENTS

What is the electronic configuration of the Fe2+ ion?

• [Ar] 3d4 4s2
• [Ar] 3d5 4s1
• [Ar] 3d6
• [Ar] 3d7

Why is the enthalpy of atomisation for Zinc (Zn) exceptionally low?

• Zinc has a large atomic radius
• Zinc has a low melting point
• Its filled 3d10 subshell does not contribute significantly to metallic bonding
• Zinc is less dense than its neighbors

According to Table 4.2, what is the approximate ionic radius of Ti2+?

• 79 pm
• 82 pm
• 77 pm
• 74 pm

What is the electronic configuration of the Mn3+ ion?

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

Why does the standard electrode potential for the Cu2+/Cu couple (+0.34 V) indicate about copper's reactivity?

• Copper is highly reactive and easy to oxidize
• Copper readily forms Cu+ ions
• Copper is relatively unreactive and difficult to oxidize
• Copper has a low density