General Properties of Actinides

  • All elements of the actinides are radioactive.
  • Actinides are soft, malleable, ductile and highly electropositive.
  • All actinides are silvery white color and they can be easily cut with knife. They are solid at room temperature and pressure.
  • All actinides are paramagnetic in nature.
  • They mostly combine with non-metals directly.
  • Actinides are pyrophoric (especially in finely divided form) which means when they expose to air, they instantly ignite.
  • They have several crystalline phases because they are very dense metals except – actinium which has fewer crystalline phases.
  • They easily react with hot water / dilute acid and release hydrogen gas.

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