Element - a pure substance made from only one type of atom. ​, Periodic table - lists all the chemical elements in groups and periods, Group  - on the periodic table is a vertical column, Period  - on the table is a horizontal row., Inert  - it does not react with other chemicals., compound - is a pure substance made from two or more elements which are chemically combined in a fixed ratio, chemical formula - a substance tells you which elements are present and how many atoms of each there are. ​, molecule - a tiny particle of a compound that are strongly bonded together. ​, polymer - a very long molecule made from thousands of smaller molecules joined together in a repeating pattern. ​,

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