Firstly, John Dalton showed that, collectively, the three laws, the law of definite proportion, the law of conversation of masses, and the law of multiple proportion. These three laws demonstrate the existence of the atom. Also, Using these three laws he developed a theory called, Dalton's Atomic Theory. This includes five basic principles; 1) all matter is made of indivisible and indestructible atoms, 2) atoms of a given element are identical in their physical and chemical properties, 3) atoms of different elements have different physical and chemical properties, 4) atoms of different elements combine in simple whole-number ratios to form chemical compounds, 5) atoms cannot be subdivided, created or destroyed when they are combined, separated, or rearranged in chemi

After Dalton came up with the five points, J.J. Thompson came along. He discovered that charged and magnets deflected the straight paths of cathode rays. In addition, he discovered negative and positive charged particles. He stated that the atom was made of smaller particles called, electrons and protons. In the discovery of the electron he used the Cathode-ray tube. As he researched he came up with a model of the atom, he stated that the atom was a "plum pudding model." This model featured negatively charged electrons embedded in a ball of positive charge.

After, J.J. Thompson came Ernst Rutherford, who was a student of Mr. Thompson. He created "gold-foil experiment" which untimely-disproved J.J. Thompson's theory. In this experiment he directed a beam of alpha particles at a very thin gold foil sheet. This was so the Rutherford could measure the angles of the particles coming off the gold foil. Sheet. Most of the alpha particles went through the sheet, however some of the particles hit the foil and bounced back. The reason of this was that the particles that bounced off the nucleus and the particles that went straight through traveled in the empty space. The major was that his experiment was that the atom would eventually lose its energy and collapse in the nucleus.

After Bohr and Plank, another educated scientist came along who was DeBroglie, he purposed the Wave Particle Duality Theory. T

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Approximate Word count = 960
Approximate Pages = 4 (250 words per page double spaced)