A mixture that is uniform in composition is called ___.

atomic

compound

heterogeneous

homogeneous

homogeneous

A mixture that is uniform in composition is called homogeneous.

The correct answer is "homogeneous."

To determine the answer to this question, it is necessary to understand the definitions of the terms given as options.

- Atomic: This term refers to individual atoms, which are the building blocks of all matter. It does not pertain to the composition of mixtures.
- Compound: A compound is a substance formed by the chemical combination of two or more elements in fixed proportions. It is different from a mixture.
- Heterogeneous: This term describes a mixture in which the components are not evenly distributed and can be distinguished easily. This is the opposite of what the question asks for.
- Homogeneous: A homogeneous mixture, also known as a solution, is one in which the components are uniformly distributed and not easily distinguishable. In simpler terms, it appears the same throughout.

Therefore, the correct answer is "homogeneous."