Mini-Research
Beginning of paper
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 ....
Middle of paper
.... This meant that either charge varied,
mass varied or both varied. Both vary. Charge is equal to an electron, but
opposite in sign. Mass was smaller when used as a gas. From the values of e/m
for positive particles, 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-velocit ....
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Word count: 286
Page count: 2 (approximately 250 words per page)
