![]() The atomic weight of Cobalt isotopes ranges from 73 amu to 50 amu. The half-life of isotopes denotes the time taken by radioactive elements to decay or decompose. Cobalt radioactive isotopes have four meta states having less than fifteen-minute half-life. The other remaining radioactive isotopes have decay lives less than eighteen hours, for example, isotope 55Co has a half-life of 17.53 hours. Examples of radioactive Co isotopes include 60Co isotope with a half-life of approximately 5.2714 years, 56-Co has a half-life of approximately 77.27days, whereas the half-lives of 57Co and 58Co isotopes are 271.79 days and 77.27 days respectively (Barceloux, Donald and Barceloux 204). Radioisotopes of Cobalt are naturally unstable, and thus they dissipate energy. The radioactive isotopes are 60Co, 57Co, 56Co, 58Co, 55Co, 61Co, 62Co. Since it is stable, it is non-radioactive. 59Co (59-Co) cobalt naturally occurs and is a stable isotope. At room temperature, Cobalt is solid (Barceloux, Donald and Barceloux 203).Ĭobalt has eight primary isotopes namely 59Co, 60Co, 57Co, 56Co, 58Co, 55Co, 61Co, 62Co. It has a melting and boiling point of 2723℉/1495℃ and 5301℉/2927℃ respectively. According to Pauling, Cobalt has an electronegativity of 1.8. However, cobalt has two most common states of oxidation +3 and +2 (Greenwood, Norman and Alan 142).Ĭobalt is a ferromagnetic, brittle, hard metal with a bluish-white or silver-white color. Cobalt has oxidation states ranging from negative three (-3) to positive four (+4). It has an atomic mass of 58.9332 g.mol -1. Cobalt has an atomic number of 27 in addition to 27 protons in the atom’s nucleus. It belongs to periodic number four and group 9 of transition metal in the periodic table. Cobalt refers to a chemical element denoted by the symbol Co. Since its discovery, cobalt has been used by numerous industries for a variety of tasks, such as creating super-alloys and serving as a blue coloring element in paintings and ceramics. ![]() There is more proof that cobalt may be discovered in meteorites. The byproducts of the mining and processing of iron, copper, lead, and nickel can also be used to obtain cobalt (Barceloux, Donald and Barceloux 201). Erythrite, smaltite, and cobaltite are the main ores and sources of cobalt. The element was discovered in 1935 by George Brandt (Greenwood, Norman and Alan 135). The chemical element cobalt has a silvery or bluish white color. ![]()
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