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Sir William Crookes - his contribution to atomic theory

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sneca janagan

on 9 November 2015

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Transcript of Sir William Crookes - his contribution to atomic theory

Sir William Crookes investigated cathode rays , showing that they travel in straight lines which cause objects that they become in contact to, to turn fluorescent. this affect also generates alot of heat.. he believed his new analysis was a fourth state of matter, he called "radiant matter", but unfortunately his theory was proved wrong.
Cathode Rays

Sir William Crookes - his contribution to atomic theory
the Crookes tube was invented by sir william Crookes in 1875. a Crookes tube is a type of cathode-ray tube where the electrons are produced by a glow discharge in a low-pressure gas. Crookes tube experiments led to an understanding of the subatomic srtucture of the atom.
Crookes tube
thallium was discovered by Sir William Crookes in 1861. thallium is a chemical element of atomic (
81). Thallium is a soft silvery-white metal, its compounds are very poisonous. it is often used to kill pests.
Crookes discovery of thallium
Symbol: TL
Atomic number: 81
Atomic weight: 204.38 amu
Melting point: 579 degrees fahrenheit
Boiling point: 2665 degrees fahrenheit
Group: 13
Chemical properties resemble those of aluminum
Physical properties are those of lead
Used to kill pests
a spinthariscope is a device that shows the extent of alpha particles by flashes on a fluorescent screen. this was invented in 1903 by William Crookes.
yes I believe that the atomic model will continue to change brcause the atomic model started of as a single atom which has developed over the years due to many scientists that have put further knowledge into the atomic model. i feel that due to all the new technology we have now in this world we will be able to further develop the atomic model.
future atomic models
collaboration and communication between scientists are very important because when there are more people contributing to the experiment/project there are more ideas to reflect off of. like was showed in the previous slide the evolution of the atomic model was developed by many scientists, so collaboration and communication within scientists are very important.
why are collaboration and communication between scientists necessary?
Sir William Crookes
Sir William Crookes was born on June 17, 1932. he was a british chemist and physicist known for his discovery of the element thallium and his studies on the cathode rays which has been fundamental in the development of atomic physics. Crookes invented many instruments to study the behaviors of the cathode rays, although his theory of radiant matter (or forth state of matter)was proved incorrect. Crookes has discovered and invented many things such as: thallium, Crookes tube, spinthariscope, radiometer, etc...
Crookes Radiometer
the crookes radiometer is a device which converts light radiation into roatary motion. te principle was dicovered by william crookes during his studies on thallium, in 1873.
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