Discovery of the Nucleus:
Protons and Neutrons
By: Isaac, Noah, Jon
Ernest Rutherford
•
Rutherford described his 'neutral doublet', or neutron, in
1920. The particle would be uncharged but with a mass only
slightly greater than the proton. Because it was uncharged
there would be no electrical repulsion of the neutron as it
passed through matter, so it would be much more penetrating
than the proton. This would make the neutron difficult to
detect.
James Chadwick
•
James Chadwick was an English physicist who was awarded
the 1935 Nobel Prize in physics for his discovery of the
neutron in 1932. He was the head of the British scientists who
worked on the Manhattan Project during World War II.
Hans Geiger
•
Johannes "Hans" Wilhelm "Gengar" Geiger was a German
physicist. He is perhaps best known as the co-inventor of the
Geiger counter and for the Geiger–Marsden experiment
which discovered the atomic nucleus.
Ernest Marsden
•
Following the war he became New Zealand's leading
scientist, founding the Department of Scientific and Industrial
Research (DSIR) in 1926 and organizing its research
particularly in the area of agriculture. During World War II he
worked on radar research and in 1947 became scientific
liaison officer in London.
Experiments
•
•
•
•
Rutherford- Gold Foil
Chadwick- Discovered Neutrons
Geiger- Worked with Rutherford
Marsden- Worked with Rutherford
EXPERIMENTS (CONT.)
Rutherford
Experiments (CONT.)
Chadwick
Experiments (CONT.)
Geiger and Marsden worked with Rutherford
How does it fit in with the timeline?
These were very basic experiments that got
the ball rolling and it started people in the
right direction.
Have these experiments held up?
These experiments were the building blocks
for the experiments that are being conducted
today.