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Today's featured articleNihonium is a synthetic chemical element with symbol Nh and atomic number 113. It is extremely radioactive; its most stable known isotope, nihonium-286, has a half-life of about 10 seconds. In the periodic table, nihonium is a transactinide element at the intersection of period 7 and group 13. Its creation was reported in 2003 by a Russian–American collaboration at the Joint Institute for Nuclear Research in Dubna, Russia, and in 2004 by a team of Japanese scientists at Riken in Wakō, Japan. The discoveries were confirmed by independent teams working in the United States, Germany, Sweden, and China. In 2015 the element was officially recognised by the IUPAC/IUPAP Joint Working Party; naming rights were assigned to Riken, as they were judged to have been first to confirm their discovery. The name, approved in the same year (announcement pictured), derives from a Japanese word for Japan, Nihon. Few details are known about nihonium, as it has only been formed in very small amounts that decay away within seconds. ( Full article...)
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Welcome to Wikipedia, the free encyclopedia that anyone can edit.
In this English version, started in 2001, we are currently working on 6,843,221 articles.
Overview -
Questions -
Categories -
A–Z -
Portals -
Site news -
Donations
Arts |
Biography |
Geography |
History |
Mathematics |
Science |
Society |
Technology
Today's featured articleNihonium is a synthetic chemical element with symbol Nh and atomic number 113. It is extremely radioactive; its most stable known isotope, nihonium-286, has a half-life of about 10 seconds. In the periodic table, nihonium is a transactinide element at the intersection of period 7 and group 13. Its creation was reported in 2003 by a Russian–American collaboration at the Joint Institute for Nuclear Research in Dubna, Russia, and in 2004 by a team of Japanese scientists at Riken in Wakō, Japan. The discoveries were confirmed by independent teams working in the United States, Germany, Sweden, and China. In 2015 the element was officially recognised by the IUPAC/IUPAP Joint Working Party; naming rights were assigned to Riken, as they were judged to have been first to confirm their discovery. The name, approved in the same year (announcement pictured), derives from a Japanese word for Japan, Nihon. Few details are known about nihonium, as it has only been formed in very small amounts that decay away within seconds. ( Full article...)
Recently featured:
Selected anniversariesJune 29: Feast of Saints Peter and Paul (Western Christianity)
|
In the news![]()
Plaza Murillo surrounded by soldiers
|
You may read and edit articles in many different languages:
This Wikipedia is written in English. Many other Wikipedias are available; some of the largest are listed below.
Wikipedia is written by volunteer editors and hosted by the Wikimedia Foundation, a non-profit organization that also hosts a range of other volunteer projects: