Tom Sharp
Over 90 of the first 117 elements are metals. Of these, only a few exist natively in a pure state, including gold, platinum, silver, copper, iron, and osmium. Metal ores are typically sulfides, oxides, hydroxides, carbonates, and silicates.
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Over 90 of the first 117 elements are metals. Of these, only a few exist natively in a pure state, including gold, platinum, silver, copper, iron, and osmium. Metal ores are typically sulfides, oxides, hydroxides, carbonates, and silicates.
See also in The book of science:
Readings on wikipedia:
Other readings: