However, elemental chlorine was not produced until 1774, when Carl Wilhelm Scheele heated hydrochloric acid with manganese dioxide.
In 1807, Humphry Davy investigated chlorine and discovered that it is an actual element.
However, in 1811, Courtois added sulfuric acid to his process and found that his process produced purple fumes that condensed into black crystals.
As of 2019, it is the most recent element to be discovered. === Etymology === In 1811, the German chemist Johann Schweigger proposed that the name "halogen" – meaning "salt producer", from αλς [als] "salt" and γενειν [genein] "to beget" – replace the name "chlorine", which had been proposed by the English chemist Humphry Davy.
In which the gas would burn human tissue externally and internally, especially the lungs making breathing difficult or impossible depending on the level of contamination. Bromine was discovered in the 1820s by Antoine Jérôme Balard.
However, in 1826, the Swedish chemist Baron Jöns Jacob Berzelius proposed the term "halogen" for the elements fluorine, chlorine, and iodine, which produce a sea-salt-like substance when they form a compound with an alkaline metal. The names of the elements all have the ending -ine.
In 1860, George Gore, an English chemist, ran a current of electricity through [acid] and probably produced fluorine, but he was unable to prove his results at the time.
In 1886, Henri Moissan, a chemist in Paris, performed electrolysis on potassium bifluoride dissolved in anhydrous [fluoride], and successfully isolated fluorine. Hydrochloric acid was known to alchemists and early chemists.
Iodine was proven to be a new element by Joseph Gay-Lussac. In 1931, Fred Allison claimed to have discovered element 85 with a magneto-optical machine, and named the element Alabamine, but was mistaken.
In 1937, Rajendralal De claimed to have discovered element 85 in minerals, and called the element dakine, but he was also mistaken.
An attempt at discovering element 85 in 1939 by Horia Hulubei and Yvette Cauchois via spectroscopy was also unsuccessful, as was an attempt in the same year by Walter Minder, who discovered an iodine-like element resulting from beta decay of polonium.
Element 85, now named astatine, was produced successfully in 1940 by Dale R.
Segrè, who bombarded bismuth with alpha particles. In 2010, a team led by nuclear physicist Yuri Oganessian involving scientists from the JINR, Oak Ridge National Laboratory, Lawrence Livermore National Laboratory, and Vanderbilt University successfully bombarded berkelium-249 atoms with calcium-48 atoms to make tennessine-294.
As of 2019, it is the most recent element to be discovered. === Etymology === In 1811, the German chemist Johann Schweigger proposed that the name "halogen" – meaning "salt producer", from αλς [als] "salt" and γενειν [genein] "to beget" – replace the name "chlorine", which had been proposed by the English chemist Humphry Davy.
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