Tungstens

Tungsten, also known as wolfram and symbolized W, is a chemical element with atomic number 74. The name tungsten derives from Swedish tung sten, meaning “heavy stone,” while the symbol W comes from the mineral wolframite, from which the element was first extracted. Tungsten is measured in the periodic table as a transition metal and is notable for its extreme physical properties.

Tungsten occurs naturally in minerals such as wolframite and scheelite. It is mined in several countries, with China historically accounting for a large share of production, alongside other producers. The ore is processed to produce tungsten oxide or ammonium paratungstate, which is subsequently reduced to metallic tungsten in various forms (powder or ingots) for industrial use.

Properties of tungsten include a very high density (about 19.25 g/cm3) and an exceptionally high melting point (3422°C) and boiling point (5555°C). It is hard and has good wear resistance, while maintaining useful electrical and thermal conductivity for a metal. At room temperature, tungsten is relatively chemically inert, though it can form compounds under appropriate conditions.

Applications cover a wide range. Tungsten and its alloys are used in lighting historically (filaments) and in high-temperature environments, such as X-ray tubes, electrical contacts, and structural components in high-temperature equipment. Tungsten carbide, a compound of tungsten and carbon, is widely used for cutting tools, wear-resistant parts, and mining equipment. It also serves in radiation shielding and specialized aerospace and defense alloys.

Isotopes and safety: Natural tungsten comprises several stable isotopes, with 182W, 183W, 184W and 186W contributing most of the abundance. Tungsten compounds and dust can irritate tissues; tungsten metal is generally regarded as of low toxicity, but standard industrial hygiene practices apply.