1/1/2024 0 Comments Iron symbol and group number![]() ![]() Cast iron contains 2% – 4.0% carbon, 1% – 6% silicon, and small amounts of manganese.Its only significance is that of an intermediate step on the way from iron ore to cast iron and steel. Pig iron has 4% – 5% carbon and contains varying amounts of contaminants such as sulfur, silicon and phosphorus.Steel is the best known alloy of iron, and some of the forms that iron can take include: Its combination of low cost and high strength make it indispensable, especially in applications like automobiles, the hulls of large ships, and structural components for buildings. ![]() Iron is the most used of all the metals, comprising 95% of all the metal tonnage produced worldwide. ![]() See hemoglobin, cytochrome, and catalase. Iron-containing enzymes, usually containing heme prosthetic groups, participate in catalysis of oxidation reactions in biology, and in transport of a number of soluble gases. Iron (as Fe 2+, ferrous ion) is a necessary trace element used by all known living organisms. Some cosmological models with an open universe predict that there will be a phase where as a result of slow fusion and fission reactions, everything will become iron. When a very large star contracts at the end of its life, internal pressure and temperature rise, allowing the star to produce progressively heavier elements, despite these being less stable than the elements around mass number 60, known as the "iron group". Although a further tiny energy gain could be extracted by synthesizing 62Ni, conditions in stars are not right for this process to be favoured, and iron abundance on Earth greatly favors iron over nickel, and also presumably in supernova element production. This is formed by nuclear fusion in the stars. The universally most abundant of the highly stable nucleides is, however, 56Fe. Nuclei of iron have some of the highest binding energies per nucleon, surpassed only by the nickel isotope 62Ni. The many iron-carbon allotropes, which have very different properties, are discussed in the article on steel. ![]() Iron is used in the production of steel, an alloy or solid solution of different metals, and some non-metals, particularly carbon. In order to obtain elemental iron, the impurities must be removed by chemical reduction. Iron is a metal extracted from iron ore, and is almost never found in the free elemental state. The concentration of iron in the various layers of the Earth ranges from very high at the inner core to only a few percent in the outer crust. Iron is also the most abundant element by mass, making up 35% of the mass of the Earth as a whole. Iron makes up 5% of the Earth's crust and is second in abundance to aluminium among the metals and fourth in abundance among the elements. It is believed that iron is the tenth most abundant element in the universe. Iron and nickel are therefore the most abundant metals in metallic meteorites and in the dense-metal cores of planets such as Earth. Iron and nickel are notable for being the final elements produced by stellar nucleosynthesis, and thus the heaviest elements which do not require a supernova or similarly cataclysmic event for formation. Iron ( IPA: /ˈʌɪə(r)n/) is a chemical element with the symbol Fe ( Latin: ferrum) and atomic number 26. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |