|Atomic Mass||204.383 g.mol −1|
|Discovered by||Sir William Crookes in 1861|
Chemical Properties of Thallium
|Group||Boron||Melting point||304 °C|
|Period||6||Boiling point||1473 °C|
|Block||13||Density (g cm−3)||11.71 g.cm−3 at 20°C|
|Atomic number||81||Relative atomic mass||204.383 g.mol -1|
|State at 20°C||Solid||Key isotopes||205Tl|
|Electron configuration||[Xe] 4f14 5d10 6s2 6p1||CAS number||7440-28-0|
|ChemSpider ID||4514293||ChemSpider is a free chemical structure database|
What is Thallium?
- Thallium (Tl) with an atomic number of 81 is found in the periodic table with the symbol.
- Thallium is not freely found in nature. It is a soft grey post-transition metal. It resembles tin when isolated but when exposed to air it may discolour.
- There are around eighty-one electrons present in the atom of thallium with an electronic configuration of [Xe] 4f14 5d10 6s2 6p1.
- This element can be generated artificially. It can be obtained by smelting of lead and zinc. It is generally obtained as a by-product in the production of sulphuric acid.
Uses of Thallium
- In ancient times it was used as a rat poison and as an ant killer.
- Thallium compounds are used in the manufacture of glasses.
- It is used in photocells.
- It is used in the production of infrared optics.
Properties of Thallium
- Thallium melts easily.
- Thallium Salts that are soluble are generally toxic. They are merely tasteless.
- It oxidizes at +3 and +1 oxidation states forming ionic salts.
- There are several thallium compounds wherein Thallium(III) resembles the aluminum (III) compounds.
Certain Facts About Thallium
- It was named after Greek word thallus which means twig.
- Thallium is suspected to be carcinogenic. Hence direct contact should be avoided with the skin.