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Physical and Chemical Properties of First Transition Series

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Estimated time: 3 minutes
Maharashtra State Board: Class 12

Key Points: Physical and Chemical Properties

  • Soft, silvery metals; good conductors
  • Most common oxidation state: +3
  • Also show +2 and +4 (less common)
  • Lanthanoid contraction: radius decreases from La to Lu (poor 4f shielding)
  • Hydroxides are basic; basicity decreases from La to Lu
  • Colour due to f–f transitions; f⁰/f¹⁴ ions are colourless
  • Mostly paramagnetic (unpaired electrons)
  • Ionisation enthalpy shows a slight decrease with irregularities
  • Form oxides, halides, hydrides and nitrides
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