Question

Why are atoms of lithium, sodium, and potassium almost never found alone in nature

Answer 1

They only have one electron in their outer most shell which makes them very reactive.

Answer 2

The elements are exist in nature in the combined and the free state. The metals and non metals may combine with the other elements in the nature.

Lithium, potassium and sodium are the highest reactive element. If they present in the free state, they can explode in the air catches fire easily. This is the main reason that they never found in the free state in the nature.