What does the discovery of iridium metal

Iridium. 1.Yuanhe Chai imitation megastove: periodic group VIII platinum element, symbol IR, atomic number 77, atomic weight, outer electron shell arrangement 5d76s2, first ionization energy electron volts.

2.Physical properties: Silvery-white metallic, hard and brittle.

During thermal processing, as long as it is not annealed, it can be expanded into filaments and thin sheets; Once annealed, it loses its ductility and becomes hard and brittle. Density grams of cubic centimeters. Melting point 2410+-40c.

Boiling point 4130c. Face-centered cubic crystals.

3.Chemical properties: The chemical properties are very stable, insoluble in acids, slightly soluble in aqua regia; Slightly attacked by molten sodium hydroxide, potassium hydroxide and sodium dichromate. There is a strong tendency to form complexes. The main valencies are +2, +4, +6.

4.History: Iridium, derived from iris, means "goddess of rainbows". In 1803, Zen fiber was discovered by the Englishman Tennant.

5.Application: Pure iridium is used exclusively in aircraft spark plugs.

It is mostly used to make scientific instruments, thermocouples, resistance wires, etc. It is used as an alloy to enhance the hardness of other metals. It is an alloy formed with platinum (10% IR and 90% PT), which is often used to make international standard meters because of its very small expansion coefficient.

According to the entries in the "Little Dictionary of Chemistry".

Located in the eighth group, viiiIt is a transition metal element, iridium is 1 part per million in the earth's crust, and is often dispersed together with platinum series in various ores of alluvial deposits and placer deposits.

Iridium is a platinum-based metal that is white like platinum with a hint of yellow. Iridium is hard and brittle and has a very high melting point, making it difficult to cast and plasticize. Iridium is the only metal that retains excellent mechanical properties in air above 1600 °C.

It has an extremely high boiling point, ranking 10th among all elements. Iridium exhibits superconductor properties below k.

Iridium: atomic number 77, atomic weight, element name ** in Latin, the original meaning is "rainbow". In 1803, when the British chemist Tennant and the French chemist Descoty dissolved crude platinum with aqua regia, they discovered two new elements—osmium and iridium—from the black powder remaining at the bottom of the vessel.

Iridium is found in the earth's crust in parts per million and is often dispersed along with platinum series in various ores of alluvial and placer deposits. There are two isotopes in nature: iridium-191 and iridium-193.

Hello dear, thank you for your consultation, it is a pleasure to serve you. The iridium element has the symbol IR, atomic number 77, and relative atomic mass. Iridium is 1 part per million in the earth's crust and is often dispersed with platinum series in various ores of alluvial and placer deposits.

There are two isotopes in nature: iridium-191 and iridium-193.