chpt 4 vocab

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Anonymous
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45196
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chpt 4 vocab
Updated:
2010-10-26 17:11:42
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chemistry
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chpt 4 chemisrty vocab
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  1. smallest particle of an element that retains its identity in a chemical reaction
    atom
  2. weighted average of the masses of the isotopes of an element
    atomic mass
  3. unit of mass equal to one-twelfth the mass of a carbon-12 atom
    atomic mass unit
  4. number of protons in the nucleus of an atom of an element
    atomic number
  5. stream of electrons produced at the negative electrode of a tube containing a gas at low pressure
    cathode ray
  6. first theory to relate chemical changes to events at the atomic level
    Dalton's atomic theory
  7. negatively charged subatomic particle
    electron
  8. veritcal column of elements in a periodic table
    group
  9. atoms of the same element that have the same atomic # but different atomic masses due to a different # of neautrons
    isotopes
  10. total # of protons with no charge and a mass of 1 amu
    mass number
  11. subatomic particle with no charge and a mass of 1 amu
    nuetron
  12. tiny, dense central portion of an atom, composed of protons and neutrons
    nucleus
  13. horizontal row of elements in the peroidic table
    period
  14. arrangement of elements in which the elements are seperated into groups based on a set of repeating properties
    periodic table
  15. positively charged subatomic particle found in the neucleus of an atom
    proton

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