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Sir William Crookes - his contribution to atomic theory
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Sir William Crookes - his contribution to atomic theory
Sir William Crookes
Spinthariscope
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.
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...
future atomic models
Crookes tube
Crookes Radiometer
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.
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.
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.
why are collaboration and communication between scientists necessary?
Cathode Rays
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.
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.
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
Crookes discovery of thallium
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.