Respuesta :
Assuming that by C4, you mean carbon 4, then it is an element.
Recall that:
- An element is a pure substance that consists of only one atom
- A compound is a substance that consists of atoms of different elements chemically linked together
- A mixture consist of two or more substances that not chemically linked in any form
Going by the definitions, one would agree that C4 is rather an element than a compound or a mixture.
More on elements can be found here: https://brainly.com/question/2486791