d and f BLOCK ELEMENTS Quiz

• It causes a steady increase in atomic or ionic radii
• It causes random and unpredictable fluctuations
• It results in a steady decrease in atomic or ionic radii
• It has no significant effect on radii

• +3
• +4
• +6
• +7

• 5f electrons are inherently more stable
• 5f electrons are always paired in their orbitals
• 5f electrons are less buried and participate more significantly in bonding processes
• 5f electrons occupy lower energy levels than 4f electrons

• Actinium (Ac)
• Thorium (Th)
• Protactinium (Pa)
• Uranium (U)

• [Rn] 5f⁶ 7s²
• [Rn] 5f⁸ 7s²
• [Rn] 5f⁷ 7s²
• [Rn] 5f⁷ 6d¹ 7s²