Hahnium - Encyclopedia.com
网页2018年5月11日 · hahn·i·um / ˈhänēəm / • n. the name formerly proposed by the American Chemical Society for the chemical element of atomic number 105 (dubnium), and by IUPAC for element 108 (hassium).
Dubnium - Wikipedia
网页Dubnium is a synthetic chemical element; it has symbol Db and atomic number 105. It is highly radioactive: the most stable known isotope, dubnium-268, has a half-life of about 16 hours. This greatly limits extended research on the element. Dubnium does not occur naturally on Earth and is produced artificially.
Hahnium Definition & Meaning - Merriam-Webster
网页noun. hahn· ium ˈhä-nē-əm. : dubnium. Word History. Etymology. New Latin, from Otto Hahn. First Known Use. 1970, in the meaning defined above. Time Traveler. The first known use of hahnium was in 1970. See more words from the same year. Dictionary Entries Near hahnium. Hahnemannism. hahnium. haiari. See More Nearby Entries. Cite this Entry. Style.
Dubnium | Synthetic, Radioactive, Transuranic | Britannica
网页Dubnium (Db), an artificially produced radioactive transuranium element in Group Vb of the periodic table, atomic number 105. The discovery of dubnium (element 105), like that of rutherfordium (element 104), has been a matter of dispute between Soviet …
dubnium / rutherfordium / kurchatovium / hahnium
网页2023年7月15日 · They published their discovery in 1970, proposing the element be named hahnium, after the chemist Otto Hahn who had recently passed away. That’s were things stood until the collapse of the Soviet Union and the end of the Cold War in the 1990s.
Dubnium (Db) - Periodic Table
网页Dubnium has one hundred five protons and one hundred fifty neutrons in its nucleus, and one hundred five electrons in seven shells. It is located in group five, period seven and block d of the periodic table. Also known as Hahnium, Ha. …
Overview of Dubnium Facts and Physical Properties - ThoughtCo
网页2019年7月25日 · Dubnium is a radioactive synthetic element. Here are interesting facts about this element and a summary of its chemical and physical properties.
Facts About Dubnium - Live Science
网页2013年10月21日 · Though the International Union of Pure and Applied Chemistry (IUPAC) endorsed the name dubnium, some scientists still refer to the element as “hahnium.” Discovery: In 1967, scientists in Dubna ...
Periodic Table of Elements: Los Alamos National Laboratory
网页Seven isotopes of element 105 (unnilpentium) are now recognized. The Chemistry Division's Periodic Table describes the history, properties, resources, uses, isotopes, forms, costs, and other information for each element.
Chemistry of Dubnium - Chemistry LibreTexts
网页2023年6月30日 · Dubnium (Db) is a transactinide element and is highly radioactive. The most stable known isotope, dubnium-268, has a half-life of just above a day, which greatly limits the extent of possible ….
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