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History of Atomic Structure Timeline
Transcript of History of Atomic Structure Timeline
History Of The Atomic Structure Research Project
PaggySue, Carver, Taylor, Jordan
Overall, there were many scientists who made contributions in the name of discovery to find out what everything was made of as matter. Each one aided one another in their findings and they piggy backed off of each other. If it wasnt for them, who knows when we would have found out what an atom was or what it does.
Born: December 18, 1856
Died: August 30, 1940
In 1897, J.J. Thomson believed that cathode rays were actually negative charged particles in motion.
Mr. Chadwick did most of his research from 1921 to 1935. During this time he made his famous discovery of neutrons. 1932 to be exact.
He started off by taking the alpha particle selection and shooting them at a bar of Be which gave off strange radiation that was thought to be neutrons. The neutrons then proceeded through a strip of paraffin and exited as protons.
In 1911 was the first Indy 500. The race was won by Ray Harrounat. The average speed was 74.59 miles per hour.
In Thomson's first experiment he tried separating the negative charge out of the rays. since he knew that electrically charged objects can be deflected by magnets, he placed a magnet above the path of the rays. The rays bent and the negative charge was bent the same way.
In the second experiment Thomson wanted to see if the rays would bend if there was an electrical field. The rays bent in the direction he expected for a negative charge. This showed that rays are not the same as a beam of light.
In the 3rd experiment he wanted to see if he could measure the mass to charge ratio. Thomson did this by measuring how far the ray was deflected by a magnetic field. He then found that the mass to charge ratio was over a thousand times lower than that of a hydrogen ion. This meant that the particles were very light or very highly charged.
Through these experiments J.J. Thomson discovered the electron. To model it he came up with the plum-pudding model.
The experiment took place in 1911
Born on the 22nd of March, 1868
Died on the 19th of December 1953
In the year 1932, Al Capone is sent to prison in Atlanta, Georgia during the time of Chadwick's discovery.
He started by shooting radioactive particles through gold foil and detected it with screens coated in zinc sulfide
Oil Drop Experiment
In 1909, the same year that Columbia recognized Panamas independence Millikan peformed an experiment that determined the size of the charge on a electron. This experiment was called the Oil drop experiment.
Image of Experiment
March 4, 1897, William McKinely was inaugurated to be the 25th president
How it was done
An atomizer sprayed a fine mist of oil droplets into the chamber. Some of the small droplets fell through a hole in the top floor. Millikan let them fall until they reached terminal velocity. Using the microscope he measured their terminal velocity. Lastly by using a formula he calculated the mass of each drop of oil.