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Smallest part of an element
Element
A pure substance made of only one kind of atom
Compound
substance made up of atoms of two or more different elements joined by chemical bonds
Mixture
combination of two or more different substances that are not joined by chemical bonds
Chemical symbol
A one or two letter representation of an element
Number of elements
118
Chemical reaction
the formation of a new chemical substance
Periodic table
A chart of the elements showing the repeating pattern of their properties
Property
A description of a substance
Molecule
A group of atoms bonded together
Separation of compounds
Requires a chemical reaction to break the bonds between atoms.
Formula of an element
Has a single capital letter
Formula of a compound
Has more than one capital letter, and tells you the ratio of the elements in a compound
Note 
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