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Period: to
Atomic Structure History
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"Skeptic Chemist"
Robert Boyle wrote a book titled the “Skeptic Chemist” which persuaded chemists to abandon the view that the elements are mythical things. -
Robert Boyle
Robert Boyle discovered that air is required for combustion, respiration, and sound. -
Isaac Newton
Constructed a mechanical universe that had small particles in motion. -
John Dalton
John Dalton stated that atoms can be neither created nor destroyed. -
Dalton's idea
Dalton suggested that the substances around us are made of a grouping of a specific number of atoms of different elements. -
Amadeo Avogadro
Avogadro confirmed the idea that atoms of different elements joined in simple ratios form compounds. -
J. Plucker
Plucker built the first gas discharge tube. -
James Clerk Maxwell
James projected that electric and magnetic fields filled the void. -
William Crookes
Crookes developed the vacuum pump which allowed him to cathode ray tubes with a smaller residual gas pressure. -
E. Goldstein
Goldstein used a CRT to study ‘canal rays’. -
Henri Becquerel
Becquerel discovered that some chemicals randomly decompose and give off very penetrating rays. -
J.J. Thompson
Constructed the Raisin Pudding Model that showed that matter is electrically neutral and that electrons are much lighter than atoms. -
R.A. Millikan
An oil drop experiment determined the charge and the mass of an electron. -
Ernest Rutherford
Rutherford proposed the name ‘proton’ for the positively charged particles of the nucleus. -
Cockcroft and Walton
Cockroft and Walton built an early linear accelerator and bombarded lithium with protons to produce alpha particles. -
Paul Dirac
Dirac proposed anti-particles. -
James Chadwick
Using alpha particles Chadwick discovered a neutral atomic particle in the nucleus with a mass almost the same as a proton. Thus the neutron was discovered. -
Enrico Fermi
Enrico conducted the first controlled chain reaction by releasing energy from the atoms nucleus.
