…Periodic table Element symbol = Tc Atomic number = 43 Melting point = 2200 °C Boiling point = 5030 °C Specific gravity = 11.5 Electron configuration = [Kr] 4d 5 5s 2 Main oxidation numbers = IV, VI, VII One of the metallic elements belonging to the VIIA group of the periodic table along with manganese and rhenium. It was the first element created by C. Perrier and EG Segré in 1937 by irradiating molybdenum with deuterons, and was the first artificially created element. It was named after the Greek word technētos, which means "artificial." … *Some of the terminology references "Segré, EG" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…周期表元素記号=Tc 原子番号=43融点=2200℃ 沸点=5030℃比重=11.5電子配置=[Kr]4d55s2おもな酸化数=IV,VI,VIIマンガンおよびレニウムとともに周期表第VIIA族に属する金属元素の一つ。1937年,ペリエC.PerrierとセグレE.G.Segréがモリブデンに重陽子を照射して初めてつくった元素で,人工的につくられた最初の元素である。〈人工の〉を意味するギリシア語technētosに因んで命名された。… ※「Segré,E.G.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
>>: Ségréen (English spelling)
An evergreen shrub of the Ericaceae family, also k...
Patriarch of Constantinople. Considered the leadi...
The uvula is a papilla-like protrusion that protru...
The phenomenon in which physical and chemical chan...
1871-1903 A pioneer of the Meiji period. Born in ...
Also known as nephropathy. A kidney disease charac...
A natural resin made by drying the sap of the Aca...
...Along with this, a partial low-level jet strea...
The name of a type of Shomyo (chanting). It is als...
〘Noun〙 (raket racket) A tool used to hit the ball ...
A term in Chinese thought. Also known as the theor...
It is a philosophy that the totality of all that ...
A former town in Naga District, Mie Prefecture. 80...
1637‐1712 Dutch streetscape and architectural pain...
Greek name usually given to the anonymous author o...