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ELEMENTS, ISOTOPES AND IONS 1. Complete the chart for the elements and isotopes below: NAME SYMBOL ATOMIC ATOMIC PROTONS ELECTRONS NEUTRONS NUMBER MASS # Lithium Pb 25 28 202 122 74 113 56 85 Iodine131 236U 2. Complete the chart for the ions below: NAME SYMBOL ATOMIC ATOMIC PROTONS NEUTRONS ELECTRONS NUMBER MASS # sodium 11 10 ion Ca2+ sulfide nitride 16 18 N3- SCIENTIST REVIEW 3. Match each scientist/philosopher below with his contribution to our understanding of the atom: _____1. Democritus A. Atomic Theory of Matter _____2. J. J. Thomson B. first proposed idea of atoms; coined the term “atomos” _____3. John Dalton C. gold foil experiment lead to discovery of the nucleus _____4. Ernest Rutherford D. discovered the neutron _____5. Sir James Chadwick E. discovered that each element has a unique amount of positive charge in its nucleus _____ 6. Henry Moseley F. experiments with cathode ray tubes lead to determination charge:mass ratio of electron
