The chemical elements

Not all chemical elements are listed here on ELEDEX, but we are working on it.

A chemical element is a pure substance that cannot be broken down into other substances using chemical methods. The elements are the basic materials of chemical reactions. The smallest possible quantity of an element is the atom. All atoms of an element have the same number of protons in the atomic nucleus (the atomic number). Therefore they have the same structure of the electron shell and therefore behave chemically the same.

An element is designated by an element symbol, an abbreviation usually derived from the Latin name of the element (for example Pb from plumbum, Fe from ferrum). The elements are arranged in the periodic table according to increasing nuclear charge number. A total of 118 elements have been detected to date (2018). Of these, the elements with atomic numbers from 1 to 94 occur naturally on earth, but often in the form of chemical compounds and sometimes only in extremely small traces, e.g. as short-lived intermediates in radioactive decay.

Fluorine

Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions.

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Neon

Neon is a chemical element with the symbol Ne and atomic number 10. It is a noble gas. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air.

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Sodium

Sodium is a chemical element with the symbol Na (from Latin natrium) and atomic number 11. It is a soft, silvery-white, highly reactive metal.

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Oxygen

Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.

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Boron

Boron is a chemical element with the symbol B and atomic number 5. Produced entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, it is a low-abundance element in the Solar system and in the Earth’s crust.

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Carbon

Carbon (from Latin: carbo “coal”) is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds.

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Nitrogen

Nitrogen is the chemical element with the symbol N and atomic number 7. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772.

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Beryllium

Beryllium is a chemical element with the symbol Be and atomic number 4. It is a relatively rare element in the universe, usually occurring as a product of the spallation of larger atomic nuclei that have collided with cosmic rays.

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Helium

Helium (from Greek: ἥλιος, romanized: Helios, lit. ‘Sun’) is a chemical element with the symbol He and atomic number 2.

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Hydrogen

Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.

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Lithium

Lithium (from Greek: λίθος, romanized: lithos, lit. ‘stone’) is a chemical element with the symbol Li and atomic number 3.

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