Here's why:

* Similar electronegativity: Metals have similar electronegativity values. This means they have a similar tendency to attract electrons. As a result, there is no significant difference in their ability to donate or accept electrons, which is crucial for a chemical reaction to occur.

* Formation of alloys: Instead of reacting with each other, metals often form alloys. An alloy is a mixture of two or more metals, sometimes including non-metals, that have metallic properties. The components of an alloy are not chemically bonded but are physically mixed together.

* Exceptions: There are a few exceptions to this general rule. Some metals can react with each other under specific conditions, like:

* Alkali metals: These metals are highly reactive and can react with other metals, especially in the presence of water or oxygen.

* Mercury: Mercury can form amalgams with other metals, like gold and silver.

In summary, metals generally don't react easily with each other because they have similar electronegativity values and are more likely to form alloys instead.