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Chlorine is a chemical element; it has symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them. Chlorine is a yellow-green gas at room temperature.
The halogens (/ ˈ h æ l ə dʒ ə n, ˈ h eɪ-,-l oʊ-,-ˌ dʒ ɛ n / [1] [2] [3]) are a group in the periodic table consisting of six chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and the radioactive elements astatine (At) and tennessine (Ts), though some authors [4] would exclude tennessine as its chemistry is unknown and is theoretically expected to ...
Radical fluorique appears on the list of elements in Lavoisier's Traité Élémentaire de Chimie from 1789, but radical muriatique also appears instead of chlorine. [75] André-Marie Ampère again predicted in 1810 that hydrofluoric acid contained an element analogous to chlorine, and between 1812 and 1886 many researchers tried to obtain it.
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In 1810, chlorine was given its current name by Humphry Davy, who insisted that chlorine was in fact an element. [39] The name chlorine, chosen by Davy for "one of [the substance's] obvious and characteristic properties – its colour", comes from the Greek χλωρος (chlōros), meaning green-yellow.
Chlorine, along with phosphorus, is the sixth most common element in organic matter. [1] Cells utilize chloride to balance pH and maintain turgor pressure at equilibrium. The high electrical conductivity of Cl − ions are essential for neuron signalling in the brain and regulate many other essential functions in biology [ 9 ]
A chemical element is a chemical substance whose atoms all have the same number of protons. ... For example, the relative atomic mass of chlorine is 35.453 u, which ...