Technetium

Technetium is a metal having silvery grey color. This element has physical property of tarnishing in moist air. This element is similar to element called as Rhenium. Rhenium is also a silvery white element having high weight. In 1987 the scientist was discovered the technetium is a first superconductor at 11 Kelvin and above.

General Physical Properties are,

Atomic Mass Average: 98

The Phase at Room Temperature: Solid

Melting Point: 2157 oC or 2992oF

Boiling Point: 4265 oC or 8811oF

Density: 11 g cm-3

Heat of Vaporization: 585.2 kJ/mole

Heat Capacity: 25oC

Electric Conductivity: 0.067 106/cm Ω

Thermal Conductivity: 0.506 W/cm K

Molar Volume: 8.51 cm3/mole

Physical State (at 20°C & 1atm): Solid

Vapor Pressure = 0.0229 Pa @ 2200°C

Technetium is the seventh group in periodic table and placed in between rhenium and manganese. The scientist was predicted that the chemical property of the element Technetium is very much similar to these two elements. I these two elements, technetium is more close to rhenium, especially in chemical tendency and inertness of forming covalent bonds. Like manganese, technetium does not readily form ions.

There are three oxidation state of Technetium are +7, +5, +4. By the oxidation process, technetium will exist as pertechnetate ion, chemical formula as TcO4. Technetium has dissolving property in some solutions like nitric acid, aqua regia (known as nitro-hydrochloric acid), concentrate sulfuric acid. Note that this element is not soluble in hydrochloric acid at any power. The element is corrosion inhibitor with steel. Technetium reacts with fluorine gas and sulfur at the high temperature. Also this element has characteristic spectral lines at 363nm, 403nm, 410 nm, 426 nm, 430 nm and 485nm.

General Chemical Properties of Technetium are,

Electrochemical Equivalent: 0.51651 g/amp hr

Electronegativity: 1.9 (Pauling)

Heat of Fusion: 24kJ/mol

Ionization Potential - First: 7.28

Second: 15.26

Third: 29.54

Valence Electron Potential (-eV): 180