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Neon is a colorless, odorless, inert gas that belongs to group 18 of the periodic table. It has the atomic number 10 and the chemical symbol Ne. Learn about its discovery, isotopes, characteristics, occurrence, production and applications.
Learn about the periodic table of the chemical elements, an ordered arrangement of the elements by atomic number and properties. Explore the history, structure, variations, trends and applications of the table in chemistry and physics.
A version of the periodic table indicating the origins – including stellar nucleosynthesis – of the elements. The most important reactions in stellar nucleosynthesis: Hydrogen fusion: Deuterium fusion; The proton–proton chain; The carbon–nitrogen–oxygen cycle; Helium fusion: The triple-alpha process; The alpha process; Fusion of ...
The most common isotope, helium-4, is produced on Earth by alpha decay of heavier radioactive elements; the alpha particles that emerge are fully ionized helium-4 nuclei. Helium-4 is an unusually stable nucleus because its nucleons are arranged into complete shells .
Sodium is a silvery white metallic element with atomic number 11 and standard atomic weight 22.98976928. Learn about its history, occurrence, isotopes, chemistry, uses, biological role and more on Wikipedia.
Periodic table showing the cosmogenic origin of each element. The elements heavier than iron with origins in dying low-mass stars are typically those produced by the s-process, which is characterized by slow neutron diffusion and capture over long periods in such stars.
Some molecules are sensitive to the ratio of elements, and so indicate elemental composition of the star. Different molecules are characteristic of different kinds of stars, and are used to classify them. Because there can be numerous spectral lines of different strength, conditions at different depths in the star can be determined.
This list of chemical elements named after places includes elements named both directly and indirectly for places. 41 of the 118 chemical elements have names associated with, or specifically named for, places around the world or among astronomical objects.
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