Discovery of the Nucleus: Protons and Neutrons By: Isaac, Noah, Jon

Ernest Rutherford Rutherford described his 'neutral doublet', or neutron, in 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 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.