palladium

Discovered in 1803 by William Hyde Wollaston, he named palladium after the asteroid Pallas.
He found it in South African platinum ore in samples that were created by dissolving in aqua regia. The metallic palladium and palladium-containing alloys originate from the Urals, North and South America, Ethiopia and Australia. There, however, they are exploited, but are still extracted from nickel and copper ores. Palladium does not react with oxygen, unlike silver, for example, which means that it does not tarnish. If palladium is cold-worked, as for example in the production of Mokume Gane wedding rings and jewellery, its strength and hardness increases very quickly and becomes considerably harder than platinum.Palladium is much more reactive than the related element platinum, but nevertheless belongs to the precious metals. It dissolves in nitric acid. It dissolves slowly in hydrochloric acid with the addition of air. Palladium is comparable in its precious metal character with the periodically neighbouring silver. Thus, in many acids it shows itself to be the nobler metal. In hydrochloric acid, however, it is the less noble.

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