25: manganese, Mn, a hard, brittle silvery metal used in stainless steel, 26: iron, Fe, we need this to make red blood cells, 27: cobalt, Co, used in pigments and high-strength, high-temperature steel alloys, 28: nickel, Ni, used in hybrid vehicle batteries, 29: copper, Cu, used in wiring, turns green when it oxidizes, 30: zinc, Zn, used to galvanize other metals to keep them from rusting, 31: gallium, Ga, melts at slightly above room temperature, 32: germanium, Ge, used in light-emitting diodes and semiconductors,

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