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Term | Definition |
---|---|
atom | mallest piece of matter that still retains the property of the element |
nucleus | center of an atom |
electron | are particles with an electrical charge of -1 |
protron | particles with a charge of +1 |
neutron | neutral particles with no electrical charges |
quark | small particles that make up protons and neutrons |
electron cloud | the area around the nucleus of an atom where its electrons are found |
atomic number | the # of protons in an atom is equal to this # |
mass number | is the sum of the # of protons and the # of neutrons in the nucleus |
isotope | atoms of the same elements that have different # of neutron |
average atomic mass | the weight- average mass of the mixture of isotopes |
periodic table | the elements are arranged by increasing atomic # and by changes in physical and chemical properties |
groups | the vertical columns in the periodic table |
electron dot diagram | is used to represent the electrons in the outer energy level |
period | the horizontal rows on the periodic table |