Elemental Profile: Cobalt

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Cobalt is the twenty-seventh element on the periodic table, giving it twenty seven protons and electrons. Though metallic cobalt can be found, on Earth it exists primarily in the form of various compounds.

On the periodic table, the element is characterized as a transition metal. Given the sheer number of transition metals it is difficult to define any definite characteristics but, generally, transition metals are paramagnetic with more than one oxidation states. Also, metals typically (though not always) have high electrical conductivity as well as high density and high melting and boiling points.

Cobalt is a hard, lustrous, silver-gray metal that reacts very slowly with moist, but not with dry, air. It has one stable isotope.

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