Cobalt atomic number Nov 6, 2025 · cobalt (Co), chemical element, ferromagnetic metal of Group 9 (VIIIb) of the periodic table, used especially for heat -resistant and magnetic alloys. On a global basis, the leading use of cobalt is in rechargeable battery electrodes. Element Cobalt (Co), Group 9, Atomic Number 27, d-block, Mass 58. It has strong magnetic and catalytic properties, high temperature and corrosion resistance, as well as hardness and durability. Cobalt (Co) is a metal used in numerous diverse commercial, industrial, and military applications, many of which are strategic and critical. This silver-white metal is used in several vital applications due to its hard and durable nature. It is also used in powerful magnets, cutting tools and high-strength alloys in the aerospace, energy and defense sectors. Cobalt is at the heart of many technologies that power and sustain modern life. . Our members are the heart of everything we do at Cobalt. The free element, produced by reductive smelting, is a hard, lustrous, somewhat brittle, gray metal. It is a part of the transition metals group and can be found naturally in the earth's crust in various mineral forms. Cobalt occurs in the minerals cobaltite, smaltite, and erythrite, and is often associated with nickel, silver, lead, copper, and iron ores, from which it is most frequently obtained as a by-product. Jun 10, 2025 · Get periodic table facts on the chemical and physical properties of the element cobalt. Cobalt is a chemical element with the symbol Co and atomic number 27. As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. We demonstrate our strong community focus by supporting local initiatives, teaching financial literacy, sponsoring worthy causes, volunteering our time and skills, and beyond. As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. Cobalt is a hard, lustrous, silver-grey metal that is used mainly as a cathode material in lithium ion and other types of batteries. 933.