QUESTION #1 JORDAN YARBROUGH

QUESTION #1


JJ THOMSON- He used positive rays to discover a method to separate different kinds of atoms. He also discovered the electron. In 1897, he proved to other scientists that the atom was not invisible, but it in fact had electrons that you could see through a cathode ray. Later on he also discovered isotopes and improved mass spectrometry.


JAMES CHADWICK- In 1932, he, discovered the neutron. He inspired many other scientists to discover nuclear reactions. The discovery of this became well known because it


JOHN DALTON-. The modern atomic theory is something that Dalton spent a great deal of his life developing, and it is what we use today and in the future to come. His Experiments led to the discovery of the law of partial pressures and law of stoichiometry. He investigated in the gas laws and even made them better.


DMITRI MENDELEEV- He created the first periodic table and arranged them by atomic mass by using their properties/characteristics. He basically predicted unknown elements and put them into the periodic table without really knowing they were going to go there or whether there were elements to go there at all.


DEMOCRITUS- He believed that all matter consisted of tiny invisible particles. He theorized that atoms were never created but that they always existed, and they had different properties of matter. Basically, he didn’t discover anything, he just theorized almost precisely on the dot without any evidence whatsoever.


AMEDEO AVOGADRO- He is known for Avogadro’s number. What he came up with was the base for the molecular masses. He said the masses of the volume of gas had to do with their molecular weights.


RUTHERFORD- He theorized the atoms nucleus He also questioned the existence of the neuron and made a theory about that as well. Rutherford, along with some other scientists, discovered that the neutron was not the only particle inside the nucleus, which came to a result of a new atom structure. (Later to be changed again by Bohr.)


BOHR- He improved Rutherford’s structure of the atom. He realized what the electrons were good for and that they surrounded the nucleus at different levels but ONLY when energy is lost or gained.