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Transcript
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