Cobalt

Cobalt (chemical symbol - Co, from Lat. Cobalt) is a chemical element of the 9th group (according to the outdated classification - the eighth group of the secondary subgroup, VIIIB), the fourth period of the periodic system of chemical elements of D. I. Mendeleev, with atomic number 27.

A simple substance, cobalt is a silvery-white, slightly yellowish transition metal with a pinkish or bluish tint. It exists in two crystal modifications: α-Co with a hexagonal densely packed lattice, β-Co with a cubic face-centered lattice, the transition temperature αββ is 427 °C.