Atomic theory | Wikipedia audio article
Channel: wikipedia tts
Date: 24/12/2018

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Atomic_theory


00:01:23 1 History
00:01:32 1.1 Philosophical atomism
00:03:52 1.2 John Dalton
00:08:23 1.3 Avogadro
00:09:22 1.4 Brownian Motion
00:10:04 1.5 Discovery of subatomic particles
00:11:32 1.6 Discovery of the nucleus
00:12:55 1.7 First steps toward a quantum physical model of the atom
00:14:57 1.8 Discovery of isotopes
00:15:51 1.9 Discovery of nuclear particles
00:18:11 1.10 Quantum physical models of the atom
00:20:21 2 See also
00:20:30 3 Notes
00:20:39 4 Further reading
00:21:35 5 External links



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SUMMARY
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In chemistry and physics, atomic theory is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms. It began as a philosophical concept in ancient Greece and entered the scientific mainstream in the early 19th century when discoveries in the field of chemistry showed that matter did indeed behave as if it were made up of atoms.
The word atom comes from the Ancient Greek adjective atomos, meaning "indivisible". 19th century chemists began using the term in connection with the growing number of irreducible chemical elements. Around the turn of the 20th century, through various experiments with electromagnetism and radioactivity, physicists discovered that the so-called "uncuttable atom" was actually a conglomerate of various subatomic particles (chiefly, electrons, protons and neutrons) which can exist separately from each other. In fact, in certain extreme environments, such as neutron stars, extreme temperature and pressure prevents atoms from existing at all.
Since atoms were found to be divisible, physicists later invented the term "elementary particles" to describe the "uncuttable", though not indestructible, parts of an atom. The field of science which studies subatomic particles is particle physics, and it is in this field that physicists hope to discover the true fundamental nature of matter.