All terms in this list:

atom: The smallest mediaeval unit of time, equal to fifteen ninety-fourths of a second.

element: each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e., the number of protons in the nuclei

compound: composed of elements; not simple

mixture: The act of mixing.

pure substance: A pure substance is any substance that cannot be separated using physical means for instance, filtration, evaporation, distillation or chromatography. Every pure substance usually has a unique set of chemical and physical characteristics and it comprises

heterogeneous: Diverse in kind or nature; composed of diverse parts.

homogenous: Having the same genetic structure; exhibiting homogeny

chemical bond: Any of several attractive forces that serve to bind atoms together to form molecules

molecule: The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; a group of atoms held together by chemical bonds.

chemical equation: a symbolic representation of a chemical reaction; reactants are represented on the left, and products on the right

chemical formula: Alternative name for molecular formula.

product: The amount of an artifact that has been created by someone or some process.

valence electrons: an electron in the outer shell of an atom which can combine with other atoms to form molecules