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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 |