Gallium is an element with the symbol Ga and the atomic number 31. A soft silvery metal, gallium is a brittle solid at low temperatures but liquefies slightly at or just above room temperature. It will melt in the hand. It occurs in trace amounts in bauxite and zinc ores. About 98% of the consumption is in the compounds gallium nitride and gallium arsenide, used as semiconductors, primarily in light-emitting diodes (LED’s), photo detectors and solar cells.