2. ● Born December 18, 1856 in
Cheetham Hill, England
● Died August 30 ,1940 in Cambridge,
United Kingdom
● His brother was Frederick
● Thomson started his education in a
private school
● Thomson had a lot of knowledge in
science
● Thomson moved to Trinity College
in Cambridge.
● Thomson married Rose Elizabeth
Paget.
JJ Thomson Background
3. ● J.J Thomson discovered the
electron in 1897
● Made the plum pudding model of
the atom
● In 1904 the discovery of the
atomic nucleus
● Thomson’s model composed of
electrons called corpuscles
● He figured out that you can
divide atoms
4. ● Thomson’s model was not a solid but a neutral
sphere
● Thomson’s model has positive and Negative
charge
● His plum pudding model of an atomic
structure proposed in the late 19th century
5. Cathode Ray Tubes
● Thomson found rays that were green and carried electricity, scientists named these tubes cathode
tubes.
● Computers and TV contains cathode ray tubes.
● He discovered that cathode rays and the charge they deposited were intrinsically linked together.
● In the second experiment , he discovered that the charge in the cathode rays was negative. He
deduced that the cathode rays were made up of negatively-charged particles.
6. Thomson’s Accomplishments
● He was awarded the Nobel Prize in the
the Nobel Prize in Physics in 1906 for
the discovery of the electron.
● He was knighted in 1908 and
appointed to the Order of Merit in
1912
7. An electron is a is a particle with one
negative charge. All atoms are made of a
nucleus and electrons. Electrons are very small
compared to the rest of the atom.electrons
are extremely small compared to the rest
of the atom and hold negative charges
that balance the nucleus of an atom.The
mass of an electron is 1,000 times
smaller than the mass of a proton
What is an Electron?
