←Ho   La↑   ↓Lu   Tm→

Erbium ∙ erbium ∙ erbio ∙ erbio
group III: R₂O₃

• melting point: 1529°C
• boiling point: 2868°C
• density: 9.05 g/cm³

☢ radioisotopes:
Er-169 (T1/2=9.4 d) medical