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chemeurope.com's Encyclopedia of Chemistry provides articles for 64,557 entries from chemistry, pharmaceutics and material sciences as well as related scientific disciplines.

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Francium Francium (), formerly known as eka-caesium and actinium K , is a chemical element that has the symbol Fr and atomic number 87. It has the lowest known electronegativity of all known elements, and is the second rarest naturally occurring element (after as more

Cochineal

Cochineal Cochineal is the name of both crimson or carmine dye and the cochineal insect (Dactylopius coccus), a scale insect in the suborder Sternorrhyncha , from which the dye is derived. There are other species in the genus Dactylopius which can be used to produce cochineal extract, but t more

Action potential

Action potential . B. Actual recordings of action potentials are often distorted compared to the schematic view because of variations in electrophysiological techniques used to make the recording An action potential is a "spike" of positive and negative ionic discharge that travels along the membr more

Verbascum thapsus

Verbascum thapsus Verbascum thapsus (; Great Mullein or Common Mullein) is a species of mullein native to Europe , northern Africa and Asia , and introduced in the Americas and Australia . It is a hairy biennial plant that can grow to 2 m or more tall. Its small yellow flowers are dens more

Xenon

Xenon Xenon ( in the UK, in the US) is a chemical element that has the symbol Xe and atomic number 54. A colorless, heavy, odorless noble gas , xenon occurs in the earth's atmosphere in trace amounts. Although generally unreactive, xenon can undergo a few chemical reaction s such as the forma more

Chemical elements