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 dark green liquid oxide of this metal explodes on contact with most organic compounds. Bleach (-5[1])oxidizes this metal from 3+ to 5+ in a reaction (15[1])catalyzed by a complex (10[2])of (10[1])this metal (10[1])with a salen ligand, (10[1])the (10[3])Jacobsen epoxidation. (10[1])In one cluster, four atoms of this metal are successively oxidized through states S0 to S4 to then (-5[1])oxidize (*) water. This (10[2])metal’s dioxide (10[1])is the most (10[1])common cathode for alkaline (10[2])batteries. A brown precipitate of this metal’s dioxide in Baeyer’s test indicates the presence of alkenes or alkynes, which an oxyanion of this metal converts to diols. For 10 points, name this transition metal that has (10[1])the 7+ oxidation state in an oxyanion that is a powerful oxidizer with a magenta color. ■END■