Which substance is a combination of different atoms? homogeneous mixture, heterogeneous mixture, element, compound

Hi

only compound must two different atom.

Element have made by only single atom.

Compound:
A compound is formed when two or more elements chemically combine together. The elements react chemically and form chemical bonds between the atoms of the elements.

A mixture is a combination of two or more substances which are not chemically the same.
Homogeneous mixtures:
Homogeneous mixtures have uniform composition and appearance throughout .A homogeneous mixture is also called a true solution.
Example: sugar solution, ocean water, soft drinks, etc.

Heterogeneous mixtures:
Heterogeneous mixtures consist of different substances.
Examples: mixture of iron and sulphur, mixture of sand and table salt, etc.

so only elements are single atom.

all these are combination of atoms.

thanks for asking