Home / Elements / Thallium
81 Tl 204.383 u
Thallium
Post-transition
Atomic no.81
Atomic mass204.383 u
Period6
Group13
Phase (25°C)Solid
Discovered1861
Did you knowHighly toxic, historical use in poison
Element photos
Loading HD photos…
Ask AI about Thallium
Powered by Claude AI · Ask about uses, history, reactions, fun facts
← Previous Mercury Element 80 Next → Lead Element 82