Cobalt (Co), element 27 – Learn Acer periodic table

Transition metal, atomic number 27.

Cobalt is a chemical element with symbol Co and atomic number 27. Like nickel, cobalt in the Earth's crust is found only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.

Symbol Co. Atomic mass 58.9331944 u. Group 9, period 4. Electron configuration [Ar] 3d7 4s2. Electrons per shell 2, 8, 15, 2. State at room temperature: Solid. Melting point 1494.8 °C, boiling point 2926.8 °C. Discovered by Georg Brandt.

Element data from Wikipedia, CC BY-SA 3.0.

Cobalt (Co), element 27 – Learn Acer periodic table

Cobalt

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