Atoms, Molecules, And Ions Worksheet - Chapter 2 Page 3
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27J.J. Thomson
(1856-1940)
Proposed in 1897 that Cathode
Rays were actually particles
(negatively charged) that we
now know are electrons.
Thompson measured the charge/mass ratio of
8
the electron to be 1.76 10
coulombs/g.
Millikan Oil Drop Experiment
•Once the charge/mass
ratio of the electron was
known, determination of
either the charge or the
mass of an electron
would yield the other.
•Robert Millikan (1909)
determined the charge on
the electron, equal to
1.60 10
-19
C.
•Mass could be calculated
-28
as 9.11 10
g.
3
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