Name: Terbium
Symbol: Tb
Atomic Number: 65
Atomic Mass: 158.92534 g
Number of Protons/Electrons: 62
Number of Neutrons: 88
Ionic Radius:
Tb²⁺ / 0.923 Angstrom
Tb³⁺ / 0.84 Angstrom
Metal
Melting Point: 1357.0 °C
Boiling Point: 3041.0 °C
Density @ 293 K: 8.229 g/cm³
Oxide
Melting Point: 2200.0 °C
Density cubic C: 7.881 g/cm³
Formula: Tb₄O₇
Molecular weight: : 747.69 g
Metal %: 85.0
Toxicity LD 50.PO: (rat) > 1000 mg/kg
Dehydrated Carbonate
Formula *: Tb₂(CO₃)₃
Molecular weight: : 497.88 g
Oxide %: 75.1
Anhydrous Chloride
Formula *: TbCl₃
Molecular weight: : 265.28 g
Oxide %: 70.45
Toxicity LD 50.PO: (mouse) 5100 mg/kg
Anhydrous Fluoride
Formula *: TbF₃
Molecular weight: : 215.92 g
Oxide %: 86.55
Hydroxide
Formula *: Tb(OH)₃
Molecular weight: : 209.95 g
Oxide %: 89.05
Dehydrated Nitrate
Formula *: Tb(NO₃)₃
Molecular weight: : 344.94 g
Oxide %: 54.2
Toxicity LD 50.PO: (rat) 5000 mg/kg
Dehydrated Oxalate
Formula *: Tb₂(C₂O₄)₃
Molecular weight: : 581.91 g
Oxide %: 64.25
Anhydrous sulfate
Formula *: Tb₂(SO₄)₃
Molecular weight: : 606.02 g
Oxide %: 61.7

Date of discovery: 1843
Discoverer: Carl Mosander