![]() Like all transition metals, cobalt is a good conductor of heat and electricity due to the ability of the valence electrons to move freely between atoms. ![]() This layer serves as a protection or passivation layer that prevents further oxidation or corrosion. In air or oxygen environment, it is oxidized, forming a thin layer of cobalt oxide on the surface of the metal. Boiling Point: 2927 ☌ = 5301 ☏ = 3200 KĬobalt is a moderately reactive metal.The higher the temperature, the more likely materials are to lose their magnetic properties because the high temperature provides energy for the electrons to move around and change configurations, disrupting the magnetic field. Additionally, cobalt retains its magnetic property to the highest temperature of all magnetic elements (1115 ☌). However, in the case of cobalt, it has three unpaired electrons which all share the same configuration (following Hund’s rule), so the magnetic fields of these unpaired electrons join together to give an overall magnetic atom. Electrons can have one of two configurations, either “spin up” or “spin down.” When electrons are paired in an orbital, they are paired with one spin up electron and one spin down electron (following the Pauli Exclusion principal), canceling out any magnetic moment. This magnetic property stems from how the electrons are arranged within the cobalt atoms. It is one of three naturally occurring magnetic elements (the other two are iron and nickel). Something unique about cobalt is that it is magnetic. Physical PropertiesĪt room temperature and pressure, cobalt is a lustrous, hard, and brittle metal. It is classified as a solid transition metal, and because it is a transition metal, cobalt is a good conductor of heat and electricity. In general, cobalt and its compounds are considered slightly toxic to the skin and moderately toxic when ingested.Ĭobalt is a reactive metal and forms many different compounds. Humans do need trace amounts of cobalt to survive, but cobalt is a carcinogen when consumed in large amounts. It is able to withstand high heat without melting and is resistant to corrosion, important qualities for many applications. In nature, it is found as part of rock minerals. Number of Neutrons : 32Ĭobalt is a hard, shiny metal with a blue-ish tint.It can only be synthesized using nuclear reactors. Meitnerium (the fourth element in the group) has never been found in nature. They are all relatively rare in the Earth’s crust. The first three elements in Group 9 are all hard, silver metals with high melting and boiling points. ![]() Group 9 elements fall within the larger group known as the transition metals. ![]() The cobalt ores always contain arsenic, a highly toxic element, which would be released during the attempts to produce copper or nickel, adding to the difficulty or trickery of dealing with this substance.Ĭobalt is the first element in Group 9 of the periodic table. Cobalt is used in magnets, gas and jet turbines, paints, and pottery.Ĭobalt’s name is derived from a German word: “kobald” which means “goblin.” This term originally came about because miners wanted to use the cobalt ore to produce copper or nickel, which failed (it produced cobalt oxide instead). It is a transition metal that is located with the other transition metals in the middle of the periodic table (the d-block). “Cobalt (27 Co)” by Hi-Res Images of Chemical Elements has not been altered and is licensed under CC Attribution 3.0 Unported.Ĭobalt is a shiny silver-blue metal at room temperature and pressure. ![]()
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