The Periodic Table/81 - Thallium (Tl)

Element Thallium (Tl, 81)

Here you can read more about the chemical element Thallium. Its shemical symbol is Tl and its atomic number is 81. The relative atomic mass of Thallium is 204.3833 u. The elemental classification of Thallium is Other metals, and it belongs to group 13 and period 6 in the Periodic Table of Elements.

The density of Thallium is 11850 kg/m3. And the mineral hardness of Thallium is 1.2 Mohs. The melting point of Thallium is 577 Kelvin (304 ℃). The boiling point of Thallium is 1740 Kelvin (1467 ℃). Thallium was discovered in the year 1861 by William Crookes.

To the right (or below if you are using a mobile device with a smaller screen) you will find the information given above for the element Thallium ordered in tabular form, which might be easier to read and use if you want to quantify it in some sort.

Data about element Thallium

Chemical symbol
Element classification
Other metals
Atomic number
Relativ atomic mass
Atomic mass
204.3833 u
11850 kg/m3
Melting point
577 K   (304 ℃)
Boiling point
1740 K   (1467 ℃)
Mineral hardness
1.2 Mohs
Discovered year
Discovered by
William Crookes