|Atomic Number||81||Atomic Radius||156 pm|
|Atomic Mass||204.38||Electron Configuration||[Xe]4f145d106s26p1|
|Density||11.85g/cm3||Discovery||1861 in United Kingdom|
Can't understand these terms? Try our help page!
Brief Description: When freshly exposed to air, Thallium exhibits a metallic luster, but soon develops a bluish-grey tinge, resembling Lead in appearance. A heavy oxide builds up on Thallium if left in air, and, in the presence of water, the hydroxide is formed. The metal is very soft and malleable. It can be cut with a knife. The element and its compounds are toxic and should be handled carefully. Thallium may cause cancer. There are no uses for metallic Thallium since pure Thallium quickly combines with oxygen and water vapor from the atmosphere, forming a black, powdery substance. Thallium, used in conjunction with Sulfur or Selenium and Arsenic, forms low melting glass.