In the context of chemical compounds, what defines a compound?

A compound is defined as a combination of two or more different elements that are chemically bonded together. This definition encompasses all compounds, ranging from simple ones like water (H₂O), which consists of hydrogen and oxygen, to more complex molecules. The chemical bonds formed between the elements result in unique properties that are different from the individual elements themselves.

Understanding this concept is critical, as it lays the foundation for many areas in chemistry, such as stoichiometry, molecular structure, and reactivity. A compound exhibits specific characteristics and behaviors that are not present in the uncombined elements, illustrating the significance of chemical bonds in forming new substances.

The other choices do not accurately reflect the definition of a compound. A single type of atom refers to an element, not a compound. A poorly mixed solution does not denote a compound; instead, it describes a physical mixture where the components are not evenly distributed. An element from the periodic table, while foundational to chemistry, does not qualify as a compound, as it does not involve the union of multiple different elements.