Atom-The basic unit for a chemical element.
Compound-A thing that is composed of two or more separate elements.
Element-A part or aspect of something abstract,especially something that is essential or characteristic.
Heterogeneous mixture-A mixture that is not uniform in composition.
Homogeneous mixture-A mixture that has uniform compositions and properties throughout.
Law of Constant Composition-States that all samples of a given chemical compound have the same elemental composition by mass.
Matter-A physical substance that takes up space and possesses rest mass.
Molecule-A group of atoms bonded together,representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
What the pictures are from top to bottom.