What is a characteristic property of alkali metals?

A characteristic property of alkali metals is that they are soft and can easily be cut with a knife. This softness is a result of their metallic structure, which allows layers of atoms to slide over each other with little resistance. This is particularly true for the heavier alkali metals, such as sodium and potassium, which can be easily sliced through with a knife.

This property sets alkali metals apart from other categories of metals, which are typically harder and more rigid. The unique atomic structure of alkali metals, characterized by a single electron in their outermost shell, contributes to their reactivity and physical properties, including their softness.