Which of the following is an example of a precious metal?

Gold is classified as a precious metal due to its rarity, lustrous appearance, and resistance to corrosion and tarnishing. Precious metals are generally characterized by their high economic value, which is often a result of their demand for use in jewelry, investment, and various industrial applications. Gold has been used as a form of currency and a store of value throughout human history, making it significant in both economic and cultural contexts.

In contrast, lead and iron are more commonly found and utilized for industrial purposes rather than being valued for their beauty or scarcity. Lead is primarily used in batteries and radiation shielding, while iron is abundant and forms the basis of steel production. Silicon, although important in electronics and semiconductors, is not classified as a metal and thus does not fall under the category of precious metals.