Here's why:

* Metallic bonds: Metals are held together by strong metallic bonds, which involve a "sea" of delocalized electrons. These bonds are very difficult to break.

* Polarity: Water is a polar molecule, meaning it has a positive and negative end. Most metals are not polar, so they don't interact well with water molecules.

* Exceptions: There are a few exceptions to this rule. For example:

* Alkali metals (like sodium and potassium) react violently with water. They don't dissolve in the traditional sense, but they react to form hydrogen gas and a metal hydroxide.

* Some metal ions can be dissolved in water. For example, copper sulfate dissolves in water to form copper ions (Cu2+) and sulfate ions (SO42-).

In summary: Most metals are not soluble in water because their strong metallic bonds and lack of polarity make it difficult for them to interact with water molecules.