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Arisotle(384BC-322BC &Democritus (400BC)
Arisotle was a very famous greek philospher a long time ago that discovered the atom. He was born in Greece in 384BC and died in 322BC. Democritus was a philosopher that said all matter is made of indivisible particles (atomos) this was also the early atomic theory. Democritus was born in 460BC and died in 370BC -
The Law of Conservation of Mass
On August 26, 1743 Antoine Lavoisier was born in Paris, and is known as being “Father of Modern Chemistry” due to his efforts in the subject of atomic structure. In 1789 he released The Law of Conservation of Mass. This law states that mass cannot be created nor destroyed in chemical reactions. Due to this Lavoisier was able to determine what exactly happened to mass, and that never changes. Although this was a miraculous discovery other did not believe so, and he was later sent to his death in -
Law of Definite Proportions
Joseph Proust, born September 26, 1754 in Angers, France was a popular French chemist. In 1794 Proust did several experiments and created the Law of Definite Proportions. This law states that chemical compounds contain same amount of elements by mass. At first in 1806 when Proust revealed statements about this it was very controversial since a lot of ideas, for example chemical compounds were not fully developed yet. Another man named Claude Louis Berthollet argued his ideas because he believed -
Atomic Theory
John Dalton was born September 6, 1766 in United Kingdom. Dalton is most famous for the Atomic Theory in 1808. In his atomic theory he stated that elements are tiny, indivisible, indestructible particles given the name “atomos”. Also chemical reactions involve only a rearrangement of atoms, compounds have the same relative number, and atoms of the same element are identical. This theory gave the world a whole new conception of atoms. Dalton was even awarded the Royal Medal in his life. Unfortuna -
Spherical Model
Created by Dalton -
Discovery of Proton
Eugen Goldstein, born September 5, 1850 in Germany was a famous physicist. Besides discovering anode rays he also discovered the proton. He did so in 1886, with the help of a cathode ray tube. Through many experiments Goldstein had suggested the presence of a proton in one of his experiments. Although many believe Rutherford discovered the proton it was Goldstein who had found it first. Even though he is only sometimes credited for the discovery of the proton Goldstein also was awarded the Hughe -
Plum Pudding Model
Created by JJ Thomson -
Cathode Ray Tube Experiment & Electron
On December 18, 1856 JJ (Joseph John) Thomson was born in Manchester, United Kingdom. Thomson was educated at many schools for example, University of Manchester, University of Cambridge, and so many more. JJ Thomson was married to Rose Paget and they had two children named George, and Joan. Thomson is highly known around the world especially for the cathode ray tube experiment, which lead to the discovery of the electron. In 1897 the experiment was conducted and Thomson learned that the cathode -
Quantum Theory
On April 23, 1858 a man named Max Planck was born. He was educated at Humboldt University of Berlin and Ludwig Maximilian University of Munich. He also had a son whose name was Erwin. Planck originated the quantum theory around the year 1900. This theory is based on the principles of matter and matter is made of atoms, and energy has properties of particles and waves. This theory was so amazing that it earned him the Noble Prize of Physics in 1918. Planck helped make the structure of the atom ev -
Gold Foil Experiment & nucleus
Ernest Rutherford was born on August 30, 1871 in Bridgewater, New Zealand. Rutherford was educated at the University of Cambridge and is very famous in the physics & chemistry world. In 1911 he performed the Gold Foil Experiment with coworkers at the University of Manchester in England. In this experiment he shot alpha particles at a sheet of gold thinking all of them would go through. However every so often some were deflected and made Rutherford believe although the inside is empty space there -
Nuclear Model
Ernest Rutherford
old model of the atom -
Bohrs model
Designed by Bohr -
Louis de Broglie & contributions on quantum theory
Louis de Broglie was born on August 15, 1892 in France, Broglie made many contributions to the quantum theory. He was educated at the University of Paris, and in 1923 he proposed that moving particles, like electrons, have some properties of waves. In a few years his idea had been proven completely correct. This later became a basis of quantum physics. He has been given the Noble Prize in Physics, and also the Max Planck Medal before he died on March 19, 1987 in Louveciennes, France. -
Schrodingers Equation
Erwin Schrodinger was born on August 12, 1887 in Vienna Austria. He was eduacted at the University of Vienna and was married to Annemarie Bartel in 1920. He had his biggest discovery in January of 1926 in the subject of Quantum Mechanics. He created the Schrodinger equation. This equation is all about the subject of wave mechanics. Schrodinger was awarded the Noble Prize in Physics and many more before he died on January 4, 1961 in Vienna, Austria -
the uncertainty principle
Born December 5, 1901 in Germany Werner Heisenberg changed the world of physics we know today. He was educated at Ludwig Maximilian University of Munich and the University of Göttingen. Not only was he a creator of quantum mechanics but he is the man behind the uncertainty principle from 1927. The uncertainty principle states that quantities are only able to be determined by some characteristic uncertainties that cannot be small simultaneously. When figuring this out Heisenberg also had both Boh -
Quantum Mechanical Model of the Atom
Created by Schrodinger -
Modified Nuclear Model
Made by Dalton -
The Neutron
James Chadwick was born on October 5, 1891 in Bollington, United Kingdom. He was educated at many schools but Gonville and Caius College was one them. In 1932 Chadwick discovered the neutron through an experiment of tracking particle radiation and was hoping to find a neutral particle. When he did he revealed the availability of a neutron. The finding of the neutron was the last piece of the puzzle for the atom. Chadwick was awarded the Noble Prize of Physics for his discovery as well in 1935. O
