June 15, 2020
For educational institutions
⟶ Updated 16 Oct 2017 ⟶
List of edits
Aristotle Where: Greece what: All things made of fire, water, and air. how: studying, teaching and writing.
Democritus where: ancient Greece what: Discovered the smallest piece of matter How: just by observing the atom.
John Dalton where: Manchester, United Kingdom What: first modern atomic theory how: Made from combing Atoms in simple whole number ratios
Jacob Berzelius where: Sweden what: measure accurate atomic weights for the element . How: elecctrostatic
Rutherford Where: new Zealand What: that an atom had a central positive nucleus with negative electrons orbiting it. How: The gold foil experiment.
JJ Tomson Where: Manchester, England what: discovery and identification of the electron how: placed cathode tubes in electric and magnetic fields.
Alfred Nobel where : Sweden what: invented dynamite How: Made of nitroglycerin, sorbets and stabilizers.
Neil Behr Where: Denmark What: theory for the hydrogen atom on the quantum theory How: electrons orbiting a nucleues at different energy
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