INTRODUCTION
Tungsten (fomerly wolfram) is a metallic element that has the highest melting point of any metal.Pure tungsten is silver-white in color and is ductile; the more easily obtained impure form is steel-gray and is hard and brittle.
Its high density inspired its name, which comes from the Swedish words tung sten, 'heavy stone.' It ranks about 57th in abundance among the elements in Earth’s crust.
BASIC INFORMATIONS
- Atomic Number
- 74
- Atomic Mass
- 183.84
- Atomic radius
- 0.13
- Ionization energy
- 770
- Electronic config
- 2,8,18,32,12,2
- Principal Valency
- +2
- Density g/cm³
- 19.3
- Melting point °C
- 3422
- Boiling point °C
- 5555
- Type of Element
- Metal
- Electronegativity
- 1.7
- Element Category
- Chromium Group
- Appearance
- Silvery white solid
- Block
- d-block
- Period
- 6
- Group
- 6
- No of Isotopes
- 38
- Occurrence
- Combine form
- Abundance in ppm
- 1.2
- Year of Discovery
- 1783
EXTRACTION
It is obtain by reducing it's oxide
OXIDATION STATES
+6,+5,+4,+3,+2,+1,0,-1,-2 (Mildly acidic)
MAJOR SOURCE
Wolframite and Scheelite
EXAMPLES OF COMPOUND PRESENT
Sodium tungstate, Tungstic acid
ECONOMIC IMPORTANCE
* Tungsten is mainly used as filaments in incandescent lamps, as wires in electric furnaces, and in the production of hard, tenacious alloys of steel.
* It is used in the manufacture of spark plugs, electrical contact points, and as a target in X-ray tubes.
* The chief uses of tungsten are in alloy steels, high-speed tool steels, and tungsten-carbide cutting tools.
