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The Periodic Table
| Term | Definition |
|---|---|
| atomic mass | the average mass of all the isotopes of an element |
| periodic table | arrangement of the elements showing the repeating pattern of their properties |
| chemical symbol | one or two letter abbreviation for a chemical element |
| period | a horizontal row of elements in the periodic table |
| group | element in the same vertical column of the periodic table; also called a family |
| representation | the description of something in a particular way |