| http://www.w3.org/ns/prov#value | - Symbol: Mg; atomic no.: 12; atomic wt.: 24.3050; valency: 2; relative density: 1.738; melting pt.: 650??C; boiling pt.: 1090??C (C19: New Latin, from magnesia) magnesium oxide n a white tasteless substance occurring naturally as periclase: used as an antacid and laxative and in refractory materials, such as crucibles and fire bricks.
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