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John Dalton
John Dalton´s atomic theory was based upon four main ideals. The first ideal was that all elements are made up of indivisible and indestructible atoms. The second ideal was that all element´s atoms are different and vary in mass and volume. The third ideal was that compunds are formed by two or more atoms. And the last ideal was that chemical reactions occur as a result of a rearrangement in atoms. -
Jonh Dalton´s Atomic Model
Dalton´s model was a very simple model but not very far away from reality at the time. As mentioned in the principles of his research, Dalton believed that atoms were indivisible and indestructible. Because of the lack of technology during his time, John Dalton was unable to know anything further from just knowing that atoms existed but could not know what they contained. -
William Crooke
William Cooke was an englishman who contibuted to the future dscovery of the spread of electrons and their firing. Crooke used testings of cathode tubes and cathode rays; he discovered these created light and heat, to which he called a "fourth state of matter". -
JJ Thomson
JJ Thomson´s greatest contibution to the atomic theory was the discovery of the electrons. Thomson found this out through experimenting, and his model suggested that the atom was positively charged and negatively charged by surroundings of circling electrons. -
JJ Thomson´s Plum Pudding Atomic Model
Thomson´s model was based on the famous british dessert. plum pudding. With the model, Thomson suggested not that the atom had a nucleus, but that overall it was positively charged, and that within it the negative charged electrons orbited. -
Ernest Rutherford
Rutherford contibuted the dicovery of the nucleus to the atomic theory. He supported that the atom was mostly empty space, and that the most mass was taken up by the nucleus and that electrons surrounded it. -
Rutherford´s Gold Foil Experiment
The experiment ws conducted when Rutherford directed radiative particles at a gold foil and as though many particles passed through, suggesting that there was empty space, still many were bounced of to a decting screen, suggesting the existence of a nucleus. -
Rutherford´s Model
The model portrays what was relected by Rutherford´s gold foil experiment, The model shows how much "empty spce" there is in the atom and how it reflects light when it hits the nuclei. -
Bohr Model
Bohr´s model differed to the one proposed by Rutherford in his gold foil experiment since he suggested that electrons where fixed in orbits and did not move freelly around the nucleus. However, BOhr suggested that the electrons could move from orbit, something not present in the atomic model. -
Niels Bohr
Niels Bohr was a danish scientist. His major contribution to the atomic theory was the suggestion that electrons fixed themselves in orbits, each around the nucleus. Bohr came to this conclusion after carefully studying the model provided Rutherford and Thomson, and included the nucleus, yet suggested that the electrons were not moving freely. -
The Quantum Mechanical Model
The Quantum Mechanical Model functioned with the purpose of mapping the electrons in the atom. The model proposed by Erwin Schrodinger provided with a more clear view of the atom, and a count of electrons per atom as well as their densities and locations in the atom. -
James Chadwick´s Model
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James Chawick
James Chadwick´s contribution to the atomic theory was the discovery of the neutron in the nucleus of the atom. Chadwick reached this conclusion after various testing, in which he saw that the atomic number would be equivalent to the positive charge of the nucleus, however, the atomic mass was always greater than the atomic number. With that thought in mind, he found that there must have been something else in the atom...the neutron.
