Final answer:
Different samples having different properties is not characteristic of a compound; instead, compounds have a constant composition, are pure substances formed from two or more elements, and have new properties that distinguish them from their individual elements.
Step-by-step explanation:
The characteristic that is not a property of a compound is that different samples have different properties. Compounds can be represented by a chemical formula, are pure substances made of two or more elements, and have different properties from its component elements. An example would be water (H2O), which has distinct physical and chemical properties that differ from its constituent elements, hydrogen and oxygen.
Compounds have a constant composition and a specific set of properties that are consistent throughout different samples. Unlike mixtures, which can be separated into their individual substances and maintain the properties of their components, compounds exhibit completely new properties. Even with over 100 known elements, the combination of these elements can lead to the creation of millions of distinct compounds.