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lithium (Li), chemical element of Group 1 (Ia) in the periodic table, the alkali metal group, lightest of the solid elements. The metal itself—which is soft, white, and lustrous—and several of its alloys and compounds are produced on an industrial scale. atomic number 3 atomic weight 6.941 melting point 180.5 °C (356.9 °F) boiling point 1,342 °C (2,448 °F) specific gravity 0.534 at 20 °C (68 °F) oxidation state +1 electron configuration 2-1 or 1s22s1... (责任编辑：) |
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