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Sequanium
Sequanium was the proposed name for a new element that Romanian physicist Horia Hulubei reported he had discovered in 1939. The name derived from the Latin word Sequana for the river Seine running through Paris where Hulubei worked at that time. Hulubei thought he had discovered element 93 in a tantalite sample from the French region Haute-Vienne. Element 93 was synthesised in 1940 and named neptunium Neptunium is a chemical element; it has chemical symbol, symbol Np and atomic number 93. A radioactivity, radioactive actinide metal, neptunium is the first transuranic element. It is named after Neptune, the planet beyond Uranus in the Solar Syste .... It does in fact occur in nature in trace amounts, but it is not commonly believed that Hulubei actually discovered it. References Misidentified chemical elements Neptunium {{chem-hist-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Horia Hulubei
Horia Hulubei (; 15 November 1896 – 22 November 1972) was a Romanian nuclear physicist, known for his contributions to the development of X-ray spectroscopy. Education and military service Born in Iași, he graduated in 1915 first in his class at the Boarding High School of Iași. He then enrolled in the Faculty of Sciences at the University of Iași, but his studies were interrupted by the entry of Romania in World War I; conscripted into the army, he fought as a second lieutenant at the battles of Nămoloasa, Băltăreți, and Mărășești in the summer of 1917. General Henri Mathias Berthelot, the head of the French military mission to Romania, decided to send a group of young Romanians (including Hulubei) to France to train at an aviation school; upon completing the training, Hulubei participated as a pilot on a fighter aircraft of the French Air Service on the Western Front. Gravely wounded, he was awarded the Legion of Honour. Upon returning to Romania, he worked f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neptunium
Neptunium is a chemical element; it has chemical symbol, symbol Np and atomic number 93. A radioactivity, radioactive actinide metal, neptunium is the first transuranic element. It is named after Neptune, the planet beyond Uranus in the Solar System, which uranium is named after. A neptunium atom has 93 protons and 93 electrons, of which seven are valence electrons. Neptunium metal is silvery and tarnishes when exposed to air. The element occurs in three allotrope, allotropic forms and it normally exhibits five oxidation states, ranging from +3 to +7. Like all actinides, it is Radioactive decay, radioactive, radiation poisoning, poisonous, pyrophoricity, pyrophoric, and capable of accumulating in bones, which makes the handling of neptunium dangerous. Although many false claims of its discovery were made over the years, the element was first synthesized by Edwin McMillan and Philip H. Abelson at the Berkeley Radiation Laboratory in 1940. Since then, most neptunium has been and still ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seine
The Seine ( , ) is a river in northern France. Its drainage basin is in the Paris Basin (a geological relative lowland) covering most of northern France. It rises at Source-Seine, northwest of Dijon in northeastern France in the Langres plateau, flowing through Paris and into the English Channel at Le Havre (and Honfleur on the left bank). It is navigable by ocean-going vessels as far as Rouen, from the sea. Over 60 percent of its length, as far as Burgundy (region), Burgundy, is negotiable by large barges and most tour boats, and nearly its whole length is available for recreational boating; Bateaux Mouches, excursion boats offer sightseeing tours of the river banks in the capital city, Paris. There are 37 List of bridges in Paris#Seine, bridges in Paris across the Seine (the most famous of which are the Pont Alexandre III and the Pont Neuf) and dozens List of crossings of the River Seine, more outside the city. A notable bridge, which is also the last along the course of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paris
Paris () is the Capital city, capital and List of communes in France with over 20,000 inhabitants, largest city of France. With an estimated population of 2,048,472 residents in January 2025 in an area of more than , Paris is the List of cities in the European Union by population within city limits, fourth-most populous city in the European Union and the List of cities proper by population density, 30th most densely populated city in the world in 2022. Since the 17th century, Paris has been one of the world's major centres of finance, diplomacy, commerce, culture, Fashion capital, fashion, and gastronomy. Because of its leading role in the French art, arts and Science and technology in France, sciences and its early adoption of extensive street lighting, Paris became known as the City of Light in the 19th century. The City of Paris is the centre of the Île-de-France region, or Paris Region, with an official estimated population of 12,271,794 inhabitants in January 2023, or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tantalite
The mineral group tantalite manganese.html" ;"title="iron.html" ;"title="iron">Fe, manganese">Mn)Tantalum">Ta2oxygen">O6is the primary source of the chemical element tantalum, a corrosion (heat and acid) resistant metal. It is chemically similar to ''columbite'', and the two are often grouped together as a semi-singular mineral called coltan or "columbite-tantalite" in many mineral guides. However, tantalite has a much greater specific gravity than columbite (8.0+ compared to columbite's 5.2). Iron-rich tantalite is the mineral tantalite-(Fe) or ''ferrotantalite'' and manganese-rich is tantalite-(Mn) or ''manganotantalite''. Tantalite is also very close to '' tapiolite''. Those minerals have the same chemical composition, but different crystal symmetry: orthorhombic for tantalite and tetragonal for tapiolite. Tantalite is black to brown in both color and streak. Manganese-rich tantalites can be brown and translucent. Occurrence Tantalite occurs in granitic pegmatites that ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haute-Vienne
Haute-Vienne (; , ; Upper Vienne) is a département in the Nouvelle-Aquitaine region in southwest-central France. Named after the Vienne River, it is one of the twelve départements that together constitute Nouvelle-Aquitaine. The prefecture and largest city in the department is Limoges, the other towns in the department each having fewer than twenty thousand inhabitants. Haute-Vienne had a population of 372,359 in 2019.Populations légales 2019: 87 Haute-Vienne INSEE Geography Haute-Vienne is part of the Nouvelle-Aquitaine region. It is bordered by six departments; lies to the east,[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Misidentified Chemical Elements
Chemical element A chemical element is a chemical substance whose atoms all have the same number of protons. The number of protons is called the atomic number of that element. For example, oxygen has an atomic number of 8: each oxygen atom has 8 protons in its ...s that have been mistakenly "discovered". Further investigation showed that their discovery was either mistaken, that they have been mistaken from an already-known element, or mixture of two elements, or that they indicated a failing in theory where a new element had been assumed rather than some previously unknown behaviour. References {{DEFAULTSORT:Misidentified chemical elements Chemistry-related lists ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
