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Properties of Actinoids

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Estimated time: 3 minutes
Maharashtra State Board: Class 12

Key Points: Properties of Actinoids

  • Silvery white metals with high density and high melting/boiling points
  • All are radioactive
  • Show variable oxidation states (common: +3; higher states in early elements)
  • Strong reducing agents and highly reactive
  • React with O₂, halogens, H₂, S (similar to lanthanoids)
  • React with hot water to form hydroxides and H₂ gas
  • Atomic and ionic radii decrease from Ac to Lr (actinoid contraction)
  • 5f orbitals show poor shielding → irregular electronic configuration
  • Electron distribution in 5f orbitals is less certain than 4f (lanthanoids)
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