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ELECTRON- In 1897, Sir J. J. Thomas, an English physicist, measured the
deflection of cathode-ray particles in magnetic and electrical fields. As a
result he found the ratio of the charge, e, to the mass, m, of the cathode-ray
particles. He found e/m identical to those particles irrespective of the metal
the electrodes were made of or .... Middle of paper
.... m was calculated to be 1.0073 amu. This became known as
a proton.
NEUTRON- In 1932, James Chadwick detected the third of the basic parts of an
atom. He showed that uncharged particles, or neutrons, are emitted when atoms
of other elements are bombarded with high-velocity helium atoms with all
electrons remored, or an alpha particle. Neutrons were determined to have a
mass of 1.0087 amu. They are unstable outside of an atom and sl ....
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Number of words: 286
Number of pages: 2 (approx. 250 words per double-spaced page)
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