Atoms
Smallest 'building block' of matter.
Molecules
Small building block of matter that consists of two or more atoms joined/bonded together.
Ions
Small building block of matter that consists of charged atoms or molecules joined/bonded together.
Pure substances
Elements
Macroscopic (JCE stuff)
Microscopic (Carbon/diamond/graphite)
Compounds
Macroscopic (CHEM 1314 Lecture Graphics)
Microscopic (Wellesley)
Mixtures (CHEM 1314 Lecture Graphics)
Homogeneous
Heterogeneous