June 15, 2020
For educational institutions
Timeline of Atomic Structure
⟶ Updated 7 Dec 2017 ⟶
List of edits
John Dalton: Proposed an "atomic theory" with spherical solid atoms based upon
Isaac Newton: Proposed a mechanical universe with small solid masses in motion.
Michael Faraday: Studied the effect of electricity on solutions, coined term "electrolysis" as a splitting of molecules with electricity, developed laws of electrolysis. Faraday himself was not a proponent of atomism.
Lothar Meyer: Classified elements into six families by their valence.
Dmitri Mendeleev: Arranged elements into 7 groups with similar properties. He discovered that the properties of elements "were periodic functions of the their atomic weights". This became known as the Periodic Law.
James Clerk Maxwell: Proposed electric and magnetic fields filled the void.
G.J. Stoney: Proposed that electricity was made of discrete negative particles he called " electrons ".
Henri Becquerel: While studying the effect of x-rays on photographic film, he discovered some chemicals spontaneously decompose and give off very pentrating rays.
Max Planck: Used the idea of quanta (discrete units of energy) to explain hot glowing matter.
Nagaoka: Postulated a "Saturnian" model of the atom with flat rings of electrons revolving around a positively charged particle.
Abegg: Discovered that inert gases had a stable electron configuration which lead to their chemical inactivity.
Albert Einstein: Published the famous equation E=mc 2
Aston: Discovered the existence of isotopes through the use of a mass spectrograph.
Enrico Fermi: Conducted the first controlled chain reaction releasing energy from the atoms nucleus.
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