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vocabulary
| Term | Definition |
|---|---|
| atomic mass | average mass of one atom of an element |
| chemical symbol | one or two letter code that stand for an element many symbols are abbreviation of the elemt's name which may be english latin or greek in origin |
| periodic table | a chart where all elements are organize into periods and groups according to there properties |
| period | a row of elements in the periodic table arranged by atomic number |
| group | column of elements in the periodic table in which element have certian properties in common also called chemical family |
| matter | the material that all abjects and substances are made of anything that has mass and takes up space |
| element | substance that are the building blocks of all matter an element is made up of atoms |
| compound | a substance in two or more elements are chemically joined |
| atom | smallest particle into which an elements can be divided and still have the properties of that element |
| electron | a tiny negatively charged particle that moves around the nucleus of an atom |