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In the periodic table of the chemical we know the group of noble gases, but there was also some chemical elements called precious metals, whether actual precious metal? The precious metal is not a class, but metal

Assortment of precious metal elements.

Precious metal is a term for high precious metal because it has properties that are resistant to corrosion and oxidation in moist air, unlike metal bases. Some metals are considered precious metals are ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, and gold. But there are differences of opinion about elements including precious metals. Some sources state that there is a mercury including precious metals. Surprisingly few metals that are highly resistant to corrosion even not classified in kelompol precious metals, such as Titanium, Nobium and Tantalum.

Some elements of the precious metal can be dissolved well in some compounds, palladium and platinum can be dissolved in aqua regia. Aqua regia is a mixture of concentrated HCl with HNO3. Iridium and silver can be dissolved in HNO3, while Ruthenium can be dissolved in aqua regia only when there is oxygen.