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1. Q. How did they describe the atom?
A. He showed it was impossible to determine both the exact position and speed of electrons as they moved around in the atom.
3. Q. Details of experiment:
A. -He considered trying to measure the position of an electron with a gamma ray microscope.
-The high-energy photon used to illuminate the electron would give it a kick, changing its momentum in an uncertain way.
4.Q. Their conclusion:
A. The idea that electrons cannot be pinpointed.

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1. Q. How did they desrie the atom?
A. He showed that common substances always broke down into the same elements in the same proportions
3. Q. Details of the experiment:
A. Dalton discovered that oxygen + with either one or two volumes of nitric oxide in closed vessels over water = provided important experimental evidence for his incipient atomic ideas.
4.Q. Conclusion:
A. That various compounds were combinations of atoms of different elements, each of particular size and mass that neither can be created or destroyed.

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1. Q. How did they depict/ describe the atom?
A. He stipulated that electrons orbit the nucleus at fixed energies and distances, able to jump from one level to another, but not to exist in the space between.
3. Q: Details of experiment:
A.  In this model, the electrons travel around the nucleus of an atom in distinct circular orbits, or shells.

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1. Q. How did they describe the atom?
A. Rutherford described the atom as having a tiny, dense, and positively charged core called the nucleus.
3. Q. Details of their experiment (if any)
A. He shot small, positively charged alpha particles at a sheet of gold foil
4. Q. Conclusion:
A. Rutherford's model proposed that the negatively charged electrons surround the nucleus of an atom.

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1.Q. How they depicted/described the atom?
A. He describe atoms to be uniformly packed spheres of positive matter filled with negatively charged electrons.
3.Q. Details of experiment:
A:Thomson placed two oppositely-charged electric plates
around the cathode ray.
4. Thomson's conclusion:
-He discovered electrons
-J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons.