Which group of metals includes platinum, silver, and gold?

The group of metals that includes platinum, silver, and gold is categorized as precious metals. Precious metals are known for their rarity, distinct luster, and high economic value. They are often used in jewelry, electronics, and as investments due to their resistance to tarnish and corrosion, which contributes to their long-lasting nature.

These metals are typically more valuable than other categories of metals due to their scarcity and demand. They are considered noble metals because they do not react easily with other substances and are less prone to oxidation. This characteristic, along with their aesthetic appeal, makes them sought after in various applications, particularly in luxury goods and financial assets.

In contrast, other groups such as alkali metals are highly reactive and not typically used in jewelry or for investment. Rare metals, while also valuable, refer to a broader category that can include some metals that are not as economically significant or valued as precious metals. Base metals, on the other hand, are more commonly found and used in various industrial applications, and they do not possess the same level of rarity or value as precious metals. This confirms that the classification of platinum, silver, and gold as precious metals is accurate and reflects their economic significance and unique properties.