Platinum

Platinum is a chemical element with the symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Platinum is one of the rarest elements in the Earth's crust and is found in the alluvial deposits of certain rivers, such as the Ural Mountains, Columbia, and Canada. It is also found in nickel and copper ores. Here are some key points to remember about platinum:

Physical Properties

• Density: 21.45 g/cm³
• Melting Point: 1,768.3°C
• Boiling Point: 3,825°C
• Hardness: 4-4.5 on the Mohs scale

Chemical Properties

• Platinum is resistant to corrosion and oxidation, making it highly valuable in industrial and jewelry applications.
• It is a catalyst in a variety of chemical reactions, including in the catalytic converters of vehicles to reduce harmful emissions.

Uses

Platinum has several important uses, including:

• Manufacturing of jewelry
• Catalytic converters in automobiles
• Electrodes in medical devices
• Chemical and petroleum refining
• Electronics

Study Guide

When studying platinum, it's important to focus on its physical and chemical properties, as well as its uses in various industries. Here are some key questions to consider:

1. What are the physical properties of platinum?
2. How does platinum compare to other precious metals in terms of rarity and availability?
3. What are the industrial applications of platinum?
4. How is platinum used in jewelry making?
5. What are the environmental and health considerations related to platinum mining and usage?

By understanding these aspects of platinum, you can gain a comprehensive knowledge of this valuable element.