Chemical Substances
chemical substance
A material that has a definite chemical composition; may be an element or a chemical compound
chemical reaction
A process that changes some chemical substances into other chemical substances
periodic table
A tabular display of the chemical elements; organized on the basis of their atomic numbers, electron configurations, and chemical properties.
matter
All the substances of which things are made
ion
An atom that has gained or lost at least one electron
mixture
Combination of chemical substances that does not have a fixed composition and does not result from a chemical reaction
organic compounds
Compound found in living organisms; contains mainly carbon
element
Pure substance made up of just one type of atom
atom
The smallest particle of an element that still characterizes the element
chemical compound
Unique substance with a fixed composition that forms when atoms of two or more elements react