Atomic Theory Timeline

Aristotle (350 B.C.) opposed this idea with Democritus's model of the atom . Aristotle was a Greek philosopher. Numerous of his thoughts were more thought based than scientifically based. For this reason, Aristotle emphatically opposed Democritus's ideas. He felt that there was no littlest portion of matter and that diverse substances were made of earth, fire, air, and water. Aristotle did not have an atomic model due to the reality that he thought atoms didn't exist.

Democritus was the first researcher to make a model of the atom. He was the first one to find that all matter is made up of undetectable particles called atoms. He made the title "atom" from the Greek word "atomos", which implies uncuttable. He too found that atoms are strong, insdestructable, and one of a kind. His model was a circular solid ball. Democritus didn't know about a nucleus or electrons, the only thing he knew was that everything is made of atoms.

Lavoisier was a French nobleman that established a few elements and put the first table of components together. He utilized Aristotle's thoughts of fire, earth, air, and water to make tests invesigating combustion and oxidation. By utilizing past information of atomic bonding, he found critical components like oxygen, hydrogen, and sulfur. He found that water was made of oxygen and hydrogen, and air included nitrogen. Lavoisier too made the first chemistry course readings and tables.

John Dalton was an English chemist that made the Atomic Theory of Matter, a composition of past discoveries by Democritus and his own discoveries. He included in this hypothesis that all matter is made of atoms, that atoms cannot be made nor destroyed and too, atoms of distinctive elements combine in entirety proportions to shape chemical compunds. His hypothesis would afterward contribute to an progress in the atomic model.

Michael Faraday examined the impact of electricity on solutions, coined term "electrolysis" as a part of particles with power, created laws of electrolysis. Faraday himself was not a defender of atomism.

Dmitri Mendeleev organized elements into 7 bunches with comparable properties. He found that the properties of elements "were periodic functions of the their atomic weights". This got to be known as the Periodic Law.

Henri Becquerel was born into a family of scientists. With impacts from his father and granddad, Bequerel worked with properties of the atom, such as magnetism and radioactivity. His greatest accomplishments were in the field of radioactivity. In his prior works, Bequerel worked with light and the retention of light by precious stones. He moreover looked at the mechanics of X-rays. His disclosure of radioactivity permitted afterward researchers to idealize the atomic model.

J.J. Thomson was a exceptionally critical researcher when it came to the atomic model. Up until his time, all models of the atom looked like a enormous solild ball. J.J. Thomson found the electron, which driven him to make the "plum pudding" atomic model. In this model, he thought that the atom was generally positive, and negative electrons meandered around the atom. The "plum pudding" model impacted other researchers to make way better atomic models.

Max Planck was a German researcher that made the Quantum Theory. In this hypothesis, Planck expressed that energy was given off in small bundles of energy. These were called photons when talking about light. He found that the energy in wave frame is confined to particular quantities. This revelation driven to the understanding of energy levels in atoms, since quantums are jumps in the atom. This disclosure afterward added to the progress in the atomic model.

Einstein in 1905 moreover clarified the equivalency of mass and energy, communicated by the popular equation e=mc2. Yet these were not sufficient world-changing, revolutionary progresses in material science for a single year. Einstein scientifically demonstrated the presence of atoms, and in this way made a difference in all the sciences through the use of measurements and probability.

Robert Millikan was an American researcher that was exceptionally interested in J.J. Thomson's finding of the electron. J.J. Thomson anticipated that the electron was 1000 time littler than the atom. Millikan needed to demonstrate this speculation. He preformed an "oil-drop try" in which he found that J.J. Thomson was correct. Millikan was moreover included in the Quantum Theory after he was motivated by Max Planck. Millikan motivated other researchers to investigate parts of the atom.

Ernest Rutherford was another researcher that changed the atomic model. He felt that J.J. Thomson's model was inaccurate, so he made a modern one. He made the nucleus, and said that instead of the positive matter being the entirety atom, it was just in the center. He said the atom was for the most part empty space and that the electrons encompassed the positive nucleus. This model affected one of his own understudies to idealize the atomic model later on.

Niels Bohr was a Danish researcher that was a understudy of Rutherford. He chose to make a modern model based off of Rutherford's model, but changed the circle of the electron. Moreover, he made energy levels in the atom, where only a certain sum of electrons could fit on one energy level of the atom. Bohr moreover utilized Planck's thoughts in order to make quantum mechanics, his modern concept regarding energy. This model is still utilized to this day.

Erwin Scrhodinger was an Austrian researcher that worked with the Quantum model of the atom. He opposed Bohr's theory, so he made his own. He thought that the only way to discover the area and energy of an electron in an atom was to calculate its likelihood of being a certain distance from the core. This equation affected the Quantum mechanical model of the atom.

James Chadwick was an English researcher that found the neutron. Before this revelation, Rutherford had concluded that the nucleus was made of positive matter. It made sense that the atom was unbiased since the negative electrons and the positive protons cancelled out. But, Chadwick begun to address why there was a contrast between the atomic mass and the number of protons. Chadwick at that point found that the missing component was a impartial portion: the neutron.