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gallium
(Symbol Ga. ) A metallic element, atomic number 31 and atomic weight 69. 72, which is soft enough to cut with a knife. Its melting point is very low, 29. 74°C (85. 46°F) and its boiling point is 1700°C (3092°F). Gallium is used as a substitute for mercury in high-temperature thermometers.
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