Platinum

Platinum is a chemical element (atomic number 78). It is a shiny grey metal that is very dense, but also very malleable. It is also very resistant to corrosion, including exposure to acid. In addition to being a rare and precious metal, it has numerous industrial uses, such as being used in catalytic converters in exhaust systems.
In medicine, platinum is a common component in medical instruments due to its ability to be shaped easily and its ability to withstand corrosion. It is also used extensively in dentistry.
Although metallic platinum is harmless, platinum dust can cause irritation of the eyes, nose, throat and lungs.
Platinum at WikipediaCategory:Chemistry