Final answer:
The classification of substances can be determined based on their composition.
Step-by-step explanation:
Based on the information given, the classification of each substance can be determined. A substance is classified as an atomic element if it consists of individual atoms. A molecular element consists of two or more atoms of the same element bonded together. A molecular compound consists of two or more different types of atoms bonded together, and an ionic compound consists of ions held together by ionic bonds.