Thallium

Symbol

Tl

Atomic number

81

Atomic mass	204.37		Thermal conductivity	0.461
Atomic radius	1.76		Covalent radius	1.48
Density	11.85		Atomic volume	17.2
Melting point	577		Oxidation states	3,1
Boiling point	1730		Stable isotopes	2
Heat of vapor.	164.1		Electronegativity	2.04
Heat of fusion	4.142		First ionization	6.108
Specific heat	0.13		Electrical conduct.	...

Electron configuration

Thallium

Thallium is a rare metal which has found little application. It forms a high-temperature superconductor compound which has much promise. A radioisotope of thallium is used in medical diagnostic tests to measure the perfusion of blood into the heart muscle.

In the sulfide mineral hutchinsonite,(Tl, Pb)₂As₅S₉ , thallium joins with arsenic and lead.

Thallium Nuclear Data