Nobel metals are a group of chemical elements that share some common characteristics, primarily their resistance to corrosion and oxidation. They are also often dense, malleable, ductile, and excellent conductors of heat and electricity.

Here are some defining features of noble metals:

* Low Reactivity: They resist chemical reactions with other elements, making them stable and durable. This is why they're often used in jewelry, coinage, and electronics.

* High Melting Points: They require a lot of energy to melt, making them suitable for high-temperature applications.

* Resistance to Corrosion: They don't easily rust or tarnish, maintaining their appearance over time.

* Good Conductors: They excel at conducting electricity and heat, making them valuable in electronic components and heat transfer applications.

The most common noble metals include:

* Gold (Au)

* Silver (Ag)

* Platinum (Pt)

* Palladium (Pd)

* Rhodium (Rh)

* Iridium (Ir)

* Ruthenium (Ru)

* Osmium (Os)

Less common noble metals include:

* Rhenium (Re)

* Technetium (Tc)

Applications of Noble Metals:

* Jewelry and Coinage: Gold, silver, and platinum are prized for their beauty and durability.

* Electronics: Gold, silver, and platinum are used in contacts, wires, and integrated circuits.

* Catalysis: Platinum, palladium, and rhodium are used as catalysts in various chemical processes.

* Dental and Medical Applications: Gold and palladium are used in dental fillings and medical implants.

* Investments: Gold and silver are often considered safe-haven assets during economic uncertainty.

Why are they called "noble"?

The term "noble" reflects their resistance to degradation and their historical association with royalty and wealth.