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Period: to
Contributers of the atom
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Lavoisier
Lavoisier was a French chemist who is considered to be the founder of modern day chemistry. He clarified the concept of an element as a simple substance that cannot be broken down by any known method of chemical analysis. -
Charles Augustin de Coulomb
Created Coulombs law which describes the electrostatic charge between electrically charged particles, and explained that like fluids repelled and unlike fluids attracted. He published three reports on electricity and magnetism which he made by doing an experiment where he use a torsion balance to study the repulsion and attraction forces of charged particles. -
John Dalton
Created Dalton's Atomic Theory which states:
• Elements are made of extremely small particles called atoms.
• Atoms of a given element are the same in size mass and other properties.
• Atoms cannot be subdivided, destroyed or created.
• Atoms of different elements combine into whole number ratios to form chemical compounds.
• In chemical reactions atoms are combined rearranged or seperated. -
William Crookes
William Crookes was on of the first study plasmas and identified it as the fourth state of matter. He also created one of the first instruments to study nuclear radioactivity called the spinthariscope. He also discovered that negative electrons in low pressure gasses emit rays called “cathode rays” which are streams of free electrons. -
Henri Becquerel
Becquerel believed that phosphorescent materials, like uranium salts, might emit X-Ray like radiation when illuminated by bright sunlight. -
Pierre Curie and Marie Curie
These two discovered that radioactive materials cause atoms to break down spontaneously, which released energy in the form of energy and subatomic particles. -
J.J Thomson
J.J Thomas was born in 1856, at Cheetham Hill, Manchester, England and was the first person to discover the electron. Most scientists thought that an electron was the size of the smallest atom but J.J suggested that it was 1000 times smaller. -
Max Planck
In 1900 Planck discovered that energy is radiated in small amounts which he calls quanta. In 1894 he turned his attention to Black Body Radiation. Electric companies commisioned him to try and create light bulbs that gave maximum light but with a small amount of energy. -
Albert Einstein
Albert Einstein was born in Ulm, the kingdom of Wurttenburg Germany in 1879, he was the creator of special and general theories of reletivity and his hypothesis about the particle nature of light. Einstein also created a model where each atom oscillates independently – a series of equally spaced quantized space for each oscillator. -
Robert A. Millikan
Robert Millikan was born in Morrison USA, he was an American physicist known for his work in atomic physics and major science. He dealt with the fundamental constitutes of the universe, the forces that exert on one another and the results produced by these forces. -
Ernest Rutherford
Was born on August 30, 1871 in Nelson, New Zealand. He divised a new theory about the structure of the atom. He was the proffesor of physics at Manchester University and conducted studies on the magnetic properties of iron exposed to high-frequency oscillations. -
Niels Bohr
Niels Bohr helped us understand atomic structure and quantum mechanics. During the last two years of World War Two Niels was associated with the Atomic Energy Project. Then applied his work to peaceful application of atomic physics and political problems which arose from the development of atomic weapons. -
Geiger
Was the first scientist to discover DNA and also help make the Geiger counter which is a device that detects ionizing radiation particles. -
Erwin Schrodinger
Schrodinger was born on the 12th of August, 1887 in Vienna. He published many papers on unifying gravitation and electromagnetism, he was also the author of the book called "What Is Life" in 1944. He was greatly interested in atomic physics and managed to explain the movement of an electron in an atom as a wave. He created a paradox which involved a cat, alive or dead, a radioactive source, a flask of poison, something that will be triggered when a radioactive source is near by and a box. -
James Chadwick
James was born on the 18th of October, 1891 in Bollington, Chesire, England. He found a way to measure the energy being emitted from protons emerging from hydrogen atoms. He was the professor of physics at Liverpool University. -
Otto Hahn
Otto was born on the 8th of March, 1879 in Frankfurt Am Main, Hesse-Nassau, Prussia, German Empire. He is best known for his contributions to the study of radioactivity. He, along with his team, discovered that you could create elements with atomic numbers greater than 92 when you bombarded uranium atom with neutrons. -
Lise Meitner
Lise was born on the 7th of November 1878 in Vienna, Austria-Hungary. She was one of the collegues of Otto Hahn and was the first person to identify nuclear fission. -
Murray Gell
Murray was born in Manhattan, New York on September 15, 1929. He worked and received a Nobel Prize for his work on elementary particles. Murray's work invlolved cosmic ray particles which were later called Kaons and Hyperons.
