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Learn how Otto Hahn, Lise Meitner, Fritz Strassmann and Otto Frisch discovered that the nucleus of an atom can split into two or more smaller nuclei in 1938. Explore the history and background of radioactivity, nuclear transmutation and fission products.
Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei, releasing large amounts of energy and neutrons. Learn about the discovery, mechanism, products, and uses of fission for nuclear power and weapons.
An atom is the smallest particle of an element that has the same chemical properties as the element. It consists of a nucleus of protons and neutrons, surrounded by electrons. Learn about the history of atomic theory, the structure and properties of atoms, and how they form compounds.
A nuclear reaction is a process in which two nuclei or a nucleus and an external particle collide to produce one or more new nuclides. Learn about the history, types, equations, and conservation laws of nuclear reactions, and see examples of nuclear fission and fusion.
Learn how the concept of atoms evolved from ancient philosophy to modern science, and who developed the first atomic theory. John Dalton was the first to propose that matter is composed of indivisible particles called atoms, based on his observations of chemical reactions.
The Atomic Age is the period after 1945, when nuclear weapons and power were first used and developed. Learn about the scientific discoveries, the military applications, the social and environmental effects, and the cultural representations of the Atomic Age.
1800 William Nicholson and Anthony Carlisle use electrolysis to separate water into hydrogen and oxygen; 1803 John Dalton introduces atomic ideas into chemistry and states that matter is composed of atoms of different weights; 1805 (approximate time) Thomas Young conducts the double-slit experiment with light
Learn about the different phases or states of matter that depend on the constituents and external factors of atoms and molecules. Explore examples of classical, mesomorphic, plasma, condensed, magnetic, electronic, and topological states of matter.