金是唯一能显示金色的金属。具有在空气中不氧化不生锈、耐侵蚀、易加工、光泽不变等特点。由于金的产量少,自古以来人类就把金作为贵重金属(克拉克数0.005ppm),用来制作观尝用装饰品和货币等。 Gold is the only metal that can show gold. With no oxidation in the air does not rust, erosion-resistant, easy processing, the same luster and so on. Since ancient times, gold has been used as a precious metal (Clarke number of 0.005ppm) for the production of ornamental decorations and currency, due to the small production of gold.