Element Thallium (Tl)

Atomic number 81 · metal · Atomic mass 204.38 u

Atomic Mass
204.3800 u
Element Properties
Atomic Number 81
Atomic Mass 204.3800 u
Category metal / 后过渡金属
Group 13
Period 6
Block P
Electron Configuration [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹
Electronegativity (Pauling) 1.62
Phase at STP Solid
Density 11.85 g/cm³
Year Discovered 1861

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