Elemental copper objects. Copper (English: Copper) is atomic number 29 and the symbol Cu, copper is in the table element that is among 29 men take advantage of copper is not less than 10000 years found evidence that human beings can be melted to extract copper, pure has about 5000 years before Christ, which is the human will know before the gold by a known gold. When approximately 4000 years before Christ.
การแปล กรุณารอสักครู่..
