Co²⁺ is the chemical symbol for the cobalt ion with a +2 charge. Cobalt is a transition metal found in group 9 of the periodic table. In its ionic form, Co²⁺ is commonly encountered in various compounds and plays a significant role in biological systems, particularly in the vitamin B12 complex. This ion is important in industrial applications, such as in the production of batteries, catalysts, and pigments. Cobalt compounds, including cobalt(II) chloride and cobalt(II) sulfate, are used in electroplating and as colorants in glass and ceramics.