Respuesta :

znk

Answer:

Gold

Explanation:

We cannot break down elements by a chemical change.

Gold is the only element in the list

Butanal, propene, and water are wrong. They are compounds, so they can be broken down into their elements.

Answer:

[tex]\huge \boxed{\mathrm{gold}}[/tex]

Explanation:

Gold cannot be broken down by any physical or chemical methods, because it is an element. It has properties of an element not a compound nor mixture.

Gold is a chemical element with the symbol Au and atomic number 79.