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6th - 2nd Century BCE Kanada (philosopher) proposes that anu is an indestructible particle of matter, an "atom"; anu is an abstraction and not observable. [ 1 ] 430 BCE [ 2 ] Democritus speculates about fundamental indivisible particles—calls them " atoms "
The current theoretical model of the atom involves a dense nucleus surrounded by a probabilistic "cloud" of electrons. Atomic theory is the scientific theory that matter is composed of particles called atoms. The definition of the word "atom" has changed over the years in response to scientific discoveries.
This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. Development of the table of chemical elements The American chemist Glenn T. Seaborg —after whom the element seaborgium is named—standing in front of a periodic table, May 19, 1950 Part of a series on the Periodic table Periodic table forms 18-column 32-column Alternative and extended ...
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In it, Asimov presents the atom and subatomic particles in a historical context, beginning with Democritus's original thought experiments and theory of atomism, and ending with then-current knowledge of the fundamental particles.
1st century AD – Pliny the Elder in his Natural History records the story of Magnes the shepherd who discovered the magnetic properties of some iron stones. [6] 160 AD – Claudius Ptolemy writes his book Optics on reflection and refraction of light, and tabulated angles of refraction for several media. He found a refraction law valid for ...