A compound containing this element is electrolyzed in a solution of molten calcium chloride for purification in the Fray-Farthing-Chen Cambridge process. In 1972, Kenichi Honda and Akira Fujishima discovered that an (15[1])oxide of this element can catalyze the decomposition of water. The thio sol-gel process produces thin films of this element’s disulfide, which can be used to form the cathode in solid-state lithium batteries. The (*) Petasis reagent is prepared by reacting alkyllithium with the dichloride of a metallocene containing this metal. This metal is extracted from rutile in the Kroll process. (10[1])Both zinc and this metal’s dioxide are white pigments commonly added to mineral sunscreen products. For 10 points, name this corrosion-resistant metal with the chemical symbol Ti ■END■