The crystal structure at STP of this metal is by far the most complex of all metallic elements, with 58 atoms per unit cell. A compound containing twelve atoms of this metal was the first known single-molecule magnet. A dark green liquid oxide of this metal explosively decomposes on contact with most organic compounds. (15[1])In one cluster, four atoms of this metal are successively oxidized through states S0 (15[1])to S4 (15[1])to then oxidize (*) water. This metal’s dioxide is the most common cathode for alkaline batteries. A compound of this non-osmium metal and oxygen creates diols from double or triple bonds, (-5[1])causing a color change (-5[1])due to a brown precipitate (-5[1])of this metal’s dioxide in Baeyer’s test. For 10 points, name this transition metal that has the 7+ oxidation state (10[1])in an (10[1])oxyanion that is a powerful oxidizing agent with a magenta color. (10[1])■END■ (10[3]0[2])