一二三四区视频,亚洲少妇熟女色,日本久热无码视频网,欧美国产日韩大尺度,亚洲a视频,久久少妇一区二区,日韩999无码视频,刺激久久久久久久,啊啊啊啊不要啊在线

berkelium

berkelium Struktur
7440-40-6
CAS-Nr.
7440-40-6
Englisch Name:
berkelium
Synonyma:
berkelium atom;berkelium ISO 9001:2015 REACH
CBNumber:
CB41261309
Summenformel:
Bk
Molgewicht:
0
MOL-Datei:
7440-40-6.mol

berkelium Eigenschaften

Schmelzpunkt:
986 ± 25° (Fahey); mp 1050° (Katz et al., loc. cit. vol. 2, p 1150)
Siedepunkt:
~2630℃ [KAT86]
Dichte
(calc) 14.78; d (calc) 13.25
Aggregatzustand
hexagonal
Farbe
hexagonal, hexane crystals, crystalline
Bulk Modulus
52.0 GPa

Sicherheit

berkelium Chemische Eigenschaften,Einsatz,Produktion Methoden

Chemische Eigenschaften

The solubility properties of berkelium in its two oxidation states are entirely analogous to those of the actinide and lanthanide elements in the corresponding oxidation states. Thus in the tripositive state such compounds as the fluoride and the oxalate are insoluble in acid solution, and the tetrapositive state has such insoluble compounds as the iodate and phosphate in acid solution. The nitrate, sulfate, halides, perchlorate, and sulfide of both oxidation states are soluble.
The first compound of berkelium of proven molecular structure was isolated in 1962 by Cunningham and Wallman. A small quantity (0.004 microgram) of berkelium (as berkelium-249) dioxide was used to determine structure by x-ray diffraction.
Berkelium metal exists in two crystal modifications. Melting point of crystals has been estimated at 986 °C. The first production of berkelium required the solution to several problems in high energy physics. These included the necessity to synthesize the highly radioactive target elements used; safe handling procedures for the high levels of radioactivity encountered had to be developed; new systematics for predicting the modes of decay and half-lives of the still undiscovered isotopes were needed.

History

Berkelium [CAS: 7440-40-6], the atomic number is 97 and the chemical symbol is Bk. The name is derived from Berkeley, the town in California where the element was first synthesized in 1949 by the American scientific team Stanley G. Thompson, Albert Ghiorso, and Glenn T. Seaborg at the University of California, Berkeley, CA., using the nuclear reaction 241Am(4He, 2n) 243Bk. It is the eighth element in the Actinide series of the elements and was named in analogy with Terbium (for Ytterby the town in Sweden whose mine produced the ore), which is the eighth element in the Lanthanide series of the elements. The longest half-life associated with this unstable element is 1400 year 247Bk. See also Berkelium.

berkelium Upstream-Materialien And Downstream Produkte

Upstream-Materialien

Downstream Produkte


berkelium Anbieter Lieferant Produzent Hersteller Vertrieb H?ndler.

Global( 2)Lieferanten
Firmenname Telefon E-Mail Land Produktkatalog Edge Rate
Shaanxi Dideu Medichem Co. Ltd
+86-029-89586680 +86-18192503167
1026@dideu.com China 9996 58

  • berkelium atom
  • berkelium ISO 9001:2015 REACH
  • 7440-40-6
Copyright 2019 ? ChemicalBook. All rights reserved
夏津县| 五原县| 江都市| 剑阁县| 霸州市| 吴桥县| 韩城市| 伊通| 大庆市| 新巴尔虎左旗| 洪洞县| 屯门区| 保亭| 冀州市| 仁怀市| 安多县| 简阳市| 师宗县| 县级市| 安徽省| 柞水县| 方城县| 康保县| 益阳市| 台南市| 大悟县| 伊宁市| 保靖县| 乌恰县| 磐石市| 湘潭县| 杭锦旗| 高唐县| 崇左市| 保德县| 松滋市| 安塞县| 义乌市| 济阳县| 错那县| 饶河县|