The elements of group 8 (formerly called group VIII, column 1), include the transition metals iron, ruthenium, and osmium, and the transactinide hassium. Due to the existence of d electron levels, these elements, like all transition metals, tend to form colored compounds, possess variable valences, and form a great number of inorganic complexes in which the coordinate bonds are formed to the atom or ion. Ruthenium and osmium are two of the six platinum metals usually found in combination with one another. Iron exhibits strong ferromagnetic qualities. The atoms of the elements in group 8 have eight valence electrons.