←Hg   Lu↑   ↓Ac   Pb→

Thallium ∙ thallium ∙ tallio ∙ talio
group III: R₂O₃

• melting point: 303.5°C
• boiling point: 1457°C ±10°C
• density: 11.85 g/cm³

Eutectic mercury-thallium alloy freezes around -60°C. — youtube Cody’sLab

⚒ minerals:
Hutchinsonite (Tl,Pb)₂As₅S₉