Heavy metal
Generally, the density is above 4.5g/cm3, such as copper, lead, zinc, etc.;
Light metal
Low density (0.53 ~ 4.5g / cm3), chemically active, such as aluminum, magnesium and so on.
Precious metal
The content of the crust is small, the extraction is difficult, the price is high, the density is large, and the chemical properties are stable, such as gold, silver, platinum, etc.;
Rare metal
Such as tungsten, molybdenum, niobium, lithium, antimony, uranium and so on.
Non-ferrous metals refer to all metals except iron, chromium and manganese. In 1958, China included iron, chromium and manganese as ferrous metals; and 64 metals other than iron, chromium and manganese were included in non-ferrous metals. The 64 non-ferrous metals include: aluminum, magnesium, potassium, sodium, calcium, strontium, barium, copper, lead, zinc, tin, cobalt, nickel, strontium, mercury, cadmium, antimony, gold, silver, platinum, rhodium, iridium. , palladium, rhodium, iridium, ruthenium, lithium, osmium, iridium, titanium, zirconium, hafnium, vanadium, niobium, tantalum, tungsten, molybdenum, gallium, indium, lanthanum, cerium, lanthanum, cerium, lanthanum, cerium, lanthanum, cerium , é“•, é’†, 铽, é•, é’¬, é“’, é“¥, 镱, é•¥, é’ª, é’‡, silicon, boron, selenium, tellurium, arsenic, antimony.
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