मराठी

Properties of Lanthanoids

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Estimated time: 4 minutes
Maharashtra State Board: Class 12

Key Points: Properties of Lanthanoids

Physical Properties:

  • Silvery white, soft metals with moderate density
  • Good conductors of heat and electricity

Basic Character:

  • Hydroxides are ionic and basic
  • Basicity decreases from La(OH)₃ to Lu(OH)₃

Ionisation Enthalpy:

  • Gradually decreases from La to Lu with irregularities

Oxidation States:

  • The most common oxidation state is +3
  • Also show +2 and +4

Colour and Spectra:

  • Colour due to f–f transitions

Atomic and Ionic Radii (Lanthanoid Contraction):

  • Radii decrease from La to Lu
  • Due to the poor shielding of the 4f electrons

Magnetic Property:

  • Most lanthanoids are paramagnetic

Chemical Reactivity:

  • Form:
    • Oxides: Ln₂O₃
    • Hydroxides: Ln(OH)₃
    • Halides: LnX₃
    • Nitrides: LnN
    • Carbides: LnC₂

General electronic configuration: \[[Xe]4f^{0-14}5d^{0-2}6s^{2}\]

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