Platinum (Pt) is a natural white precious metal. As early as 700 BC, platinum has been shining brilliantly in the history of human civilization. In the 2000-year history of human use of platinum, it has always been considered as one of the most precious metals.

In mineral classification, platinum group minerals belong to natural platinum subgroup, including natural elemental minerals such as iridium, rhodium, palladium and platinum. Platinum group minerals are all equiaxed, with few single crystals and occasionally cubic or octahedral fine crystals.

2. palladium symbol: Pd.

Palladium, a member of the platinum group, has the element symbol Pd, which is similar to platinum in appearance, silvery white metallic luster and bright color. The specific gravity is 12, which is lighter than platinum and has strong ductility.

Melting point 1555℃, hardness 4-4.5, slightly harder than platinum. Chemical properties are relatively stable, insoluble in organic acids, cold sulfuric acid or hydrochloric acid, soluble in nitric acid and aqua regia, and it is not easy to oxidize and lose luster under normal circumstances.

Extended data:

Palladium identification method:

Metals smelted from platinum group minerals include palladium, rhodium, iridium and platinum. Palladium is a member of the platinum group, but it is different from platinum;

First, the component seal of palladium is "pd", while the component seal of platinum is "PT";

Secondly, the density of palladium is lower than that of platinum, which is also 1 cm3, and the weight of platinum is 2 1.45g, while the weight of palladium is 12.023g, which is only 56% of the former, that is to say, the weight of palladium is only a little more than half of that of platinum for jewelry of the same size (you can basically tell by holding it in your hand.

Baidu encyclopedia _ platinum

Baidu encyclopedia _ palladium