White ash is not an element or a compound. It's the residue left behind after something is burned.

Here's why:

* Elements are the simplest pure substances that cannot be broken down further (like carbon, oxygen, or iron).

* Compounds are formed when two or more elements chemically combine in a fixed ratio (like water, which is H₂O).

White ash is a complex mixture of various inorganic compounds, primarily oxides, carbonates, and sulfates. The specific composition of the ash depends on the material that was burned.

So, while it's not an element or a compound, it's the result of a chemical process (combustion) that changes the original material into a new, more stable form.