gold 3

also copper CU (cuprum). these metal coded and collected in a group, probably because they located in one area and mined together. a mine are ussually consist of large amount copper, smaller amount silver, smallest amount on gold. silver is heavier than copper, and gold is heavier than silver. thats why if a river contain some amount of these metals, gold would be at the bottom. gold is heavier 1.7 compared to iron. silver is heavier 1.2 thn iron