d and f BLOCK ELEMENTS Quiz

• Actinoids will be less reactive
• Lanthanoids will have more complex chemistry
• Actinoids will generally exhibit more complex chemistry than lanthanoids
• The 5f electrons are less stable

• Actinoid contraction is opposite to lanthanoid contraction
• Actinoid contraction is weaker than lanthanoid contraction
• They are identical in magnitude and effect
• Actinoid contraction is similar in nature but greater in magnitude

• +2
• +3
• +4
• +5

• Thorium (Th)
• Protactinium (Pa)
• Neptunium (Np)
• Uranium (U)

• It is always energetically unfavorable
• It leads to instability
• It determines the atomic mass precisely
• It is associated with a particular electronic stability