d and f BLOCK ELEMENTS

Which lanthanoid is characterized by having the electronic configuration [Xe] 4f¹⁴ 6s²?

• Lutetium (Lu)
• Ytterbium (Yb)
• Thulium (Tm)
• Erbium (Er)

What type of magnetism is associated with the Ln³⁺ ion that has a filled 4f subshell?

• Strong paramagnetism
• Ferromagnetism
• Diamagnetism
• Antiferromagnetism

What type of magnetism is associated with the Ln³⁺ ion that has a half-filled 4f subshell?

• Diamagnetism
• Weak paramagnetism
• High paramagnetism
• Ferromagnetism

What is a significant difference in the metallic radii trend between lanthanoids and actinoids?

• Lanthanoid radii decrease more sharply
• There is no significant difference
• Actinoid metallic radii generally decrease more sharply than lanthanoid radii
• Lanthanoid radii remain constant

What is the primary reason for the greater tendency of early actinoids (like U, Np, Pu) to exhibit high oxidation states (+4, +5, +6) compared to lanthanoids?

• They have fewer electrons
• They are more electronegative
• The 5f orbitals are more accessible for bonding and electron loss
• They have a larger atomic radius