Louis-Nicolas Vauquelin discovered two elements Beryllium and Chromium

Louis-Nicolas Vauquelin – discoverer of Beryllium & Chromium

Category : Personalities
Published by : Data Research Analyst, Worldofchemicals.com

Biography & contributions

Louis-Nicolas Vauquelin was a French pharmacist and chemist born on May 16, 1763 – died on November 14, 1829. Vauquelin was the discoverer of beryllium and chromium periodic table elements. Vauquelin also isolated camphoric acid, quinic acidHe isolated asparagine amino acid from asparagus plant and also discovered pectin, malic acid in apples.

Facts about beryllium

Beryllium belongs to Group 2 (IIA) element with symbol Be, atomic number 4, atomic mass 9.01 g/mol, electron configuration [He] 2s2, density 1.85 g/cm3, melting point 1287 °C, boiling point 2970 °C.

Beryllium compounds are very toxic. Its ability to scratch glass is probably due to the formation of a thin layer of the oxide. Beryllium is light, silver-gray, relatively soft metal that is strong but brittle. Beryllium alloys are used in the aerospace industry as light-weight materials for high-performance aircraft, satellites, and spacecraft.

Beryllium is also used in nuclear reactors as a reflector and absorber of neutrons, a shield and a moderator. Beryllium is used as an alloy with copper to make spark-proof tools. Beryllium is used as an alloying agent in the production of beryllium-copper.

Beryllium is also commonly used in some neutron sources in laboratory devices in which relatively few neutrons are needed, used in fuel fabrication for CANDU reactors, used at the Joint European Torus nuclear-fusion research laboratory, and it will be used in the more advanced ITER to condition the components.

Beryllium's chemical behavior is largely a result of its small atomic and ionic radii. It thus has very high ionization potentials and strong polarization while bonded to other atoms, which is why all of its compounds are covalent. Beryllium dissolves readily in non-oxidizing acids, such as HCl and diluted H2SO4, but not in nitric acid or water.

Facts about Chromium

Chromium is 22nd most abundant element in Earth's crust and it is steel-gray, lustrous, hard, metallic, and takes a high polish. Its compounds are toxic. It is found as chromite ore. Chromium can be represented with symbol Cr, atomic number 24,atomic mass 51.9 g/mol, electron configuration [Ar] 3d5 4s1,density 7.19 g/cm3,melting point 1907 °C, boiling point 2671 °C.

Chromium metal and ferrochromium alloy are commercially produced from chromite by silicothermic or aluminothermic reactions, or by roasting and leaching processes. Chromium metal has proven of high value due to its high corrosion resistance and hardness.

It is used as a protective and decorative coating on car parts, plumbing fixtures, furniture parts and many other items, usually applied by electroplating. Chromium was used for electroplating processes.

Camphoric Acid

Camphoric Acid is a white crystallisable substance obtained from the oxidation of camphor. Camphoric acid may be prepared by oxidizing camphor with nitric acid.

Quinic Acid

Quinic Acid is a cyclitol, a cyclic polyol, and a cyclohexanecarboxylic acid. It is a crystalline acid obtained from cinchona bark, coffee beans, and other plant products and made synthetically by hydrolysis of chlorogenic acid. Quinic acid is also implicated in the perceived acidity of coffee. It is a constituent of the tara tannins.

Quinic acid along with citric and malic represent a significant portion of coffee's total acid content. During roasting quinic acid progressively increases as the levels of chlorogenic acid decrease suggesting that its formation results from the cleavage of the chlorogenic acid moiety. Quinic acid concentrations reach a maximum at French roasts then progressively decrease as roasting progresses. Quinic acid has also been associated with an increase in perceived acidity as coffee infusions are left standing at elevated temperatures. Cranberries juice is also very good for your heart. It helps to lower the LDL (Bad) cholesterol level (which is the main cause to clog the arterial walls) to increase the counts of HDL (Good) cholesterol level of the body. It contains citric acid composition and quinic acid, so it also helps to protect from kidney stones, various kidney ailments, and gallbladder diseases. Quinic acid helps to stop the formation of calcium and phosphate chemicals from binding together, which becomes stones.

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