Thallium (Tl), element 81 – Learn Acer periodic table

Transition metal, atomic number 81.

Thallium is a chemical element with symbol Tl and atomic number 81. This soft gray post-transition metal is not found free in nature. When isolated, it resembles tin, but discolors when exposed to air.

Symbol Tl. Atomic mass 204.38 u. Group 13, period 6. Electron configuration [Xe] 4f14 5d10 6s2 6p1. Electrons per shell 2, 8, 18, 32, 18, 3. State at room temperature: Solid. Melting point 303.9 °C, boiling point 1472.8 °C. Discovered by William Crookes.

Element data from Wikipedia, CC BY-SA 3.0.

Thallium (Tl), element 81 – Learn Acer periodic table

Thallium

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