group 9

The elements of group 9 (formerly called group VIII, column 2), include the transition metals cobalt, rhodium and iridium, and the transactinide meitnerium. 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. Rhodium and iridium are two of the six platinum metals usually found in combination with one another. Cobalt exhibits ferromagnetic qualities. The atoms of the elements in group 9 have six valence electrons.