Which element is a metal that has the chemical symbol 'Ag'?

The element that has the chemical symbol 'Ag' is Silver. This is derived from the Latin word for silver, "argentum." Silver is known for its high electrical and thermal conductivity, and it is widely used in jewelry and various industrial applications due to its reflective properties and resistance to corrosion.

In contrast, the other elements mentioned have their own unique symbols and are distinguished from silver in both properties and applications. Copper is represented by the symbol 'Cu' and is known for its malleability and electrical conductivity. Gold, with the symbol 'Au,' is highly valued for its rarity and conductivity, often used in electronics and as a standard for currencies. Mercury, indicated by the symbol 'Hg,' is a liquid metal at room temperature, known for its use in thermometers and barometers, but it is quite different from silver in terms of characteristics and uses.