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John Dalton
John had a theory that elements are made of extremely small particles called atoms, which he believed were the same in size, weight and other properties. He proposed that compounds were made of atoms from various elements that had joined together. John Dalton
http://en.wikipedia.org/wiki/John_Dalton#Atomic_weights (13/9/13)
http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm (13/9/13) -
J.J. Thomson
J.J. Thomson was the very first to propose that the essential unit was more than 1000 times smaller than an atom, which brought him to the conclusion that there were subatomatic particles which are now known as electrons. He then went on to calculate the charge to mass ratio of electrons. J.J. Thomson
http://en.wikipedia.org/wiki/J._J._Thomson#Discovery_of_the_electron (13/9/13)
http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm (13/9/13) -
Marie Curie
Marie Curie found radium and polonium and devised the term 'radioactivity' after she had investigated the rotting and decaying of uranium and thorium. Marie Curie
http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm (15/9/13)
http://en.wikipedia.org/wiki/Marie_Curie (15/9/13) -
Ernest Rutherford
Ernest Rutherford explored radioactivity, finding two kinds that were different to X-rays in their harsh abilities. He continued his studies in Canada, where he detected the alpha, beta and gamma rays in radiation. Ernest Rutherford
http://en.wikipedia.org/wiki/Ernest_Rutherford#Scientific_research (13/9/13)
http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm (13/9/13) -
Henry Moseley
In 1913, Moseley calculated the X-ray spectra of many different chemical elements that had been discovered through the grating of crystals. He found a numerical relationship between the wavelengths of the X-rays created and the atomic numbers of the metals that were utilized as objectives in X-ray tubes. He discovered atomic numbers. Henry Moseley (12/9/13 11:30am)
http://en.wikipedia.org/wiki/Henry_Moseley
http://www.chemistry.co.nz/henry_moseley.htm (12/9/13 11:15am) -
Niels Bohr
Niels Bohr suggested a theory about the hydrogen atom built on the idea that energy is conveyed only in definite, well-defined amounts, also known as the Quantum Theory. He also suggested that the outer circuit of an atom could bear more electrons than the inner circuit. Neils Bohr
http://www.nobelprize.org/nobel_prizes/physics/laureates/1922/bohr-facts.html (13/9/13)
http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm (13/9/13) -
Francis Aston
Francis Aston researched at the Cavendish Laboratory in 1919, where he finished his first building of a mass spectograph which he then used to identify 212 isotopes (alternatives of a particular chemical element). Francis Aston
http://en.wikipedia.org/wiki/Francis_William_Aston (13/9/13)
http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm (13/9/13) -
Erwin Schrodinger
Erwin put together a wave-equation that was based on Neils Bohr's theory that electrons could be concluded as both waves and atoms. This wave-equation could correctly identify the energy levels of atoms. Erwin Schroginger
http://www.nobelprize.org/nobel_prizes/physics/laureates/1933/schrodinger-facts.html (13/9/13)
http://en.wikipedia.org/wiki/Erwin_Schr%C3%B6dinger (13/9/13) -
James Chadwick
James Chadwick discovered neutrons, hypothesising that their weight was quite close to that of a proton. James Chadwick
http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm (15/9/13)
http://en.wikipedia.org/wiki/James_Chadwick#Research (15/9/13) -
Murray Gell-mann
Murray categorised particles and their interactions. He suggested that contemplated particles are compound, meaning that they were made of tiny atoms called quarks. Murray Gell-mann
http://www.nobelprize.org/nobel_prizes/physics/laureates/1969/gell-mann-facts.html (13/9/13)
http://en.wikipedia.org/wiki/Murray_Gell-Mann (13/9/13)
