特性

CAS Number53850-35-4
PubChem CIDna
原子半径-
モル体積-
原子量[268]
ブロックd
沸点-
Bulk Modulus
カテゴリ遷移元素
結晶構造
共有結合半径149
密度39
Electrical Resistivity
電子配置[Rn] 5f14 6d3 7s2
電子殻2, 8, 18, 32, 32, 11, 2
電気陰性度-
Electrons105
5
融解熱na
蒸発熱na
イオン化エネルギー-
Magnetic Ordering
Magnetic Susceptibility
質量[268]
Mass Number105
融点-
名称ドブニウム
中性子157
原子番号262
酸化数5
周期7
固体
Poisson Ratio
陽子105
Shear Modulus
熱容量-
記号Db
熱伝導率0.58
Van der Waals radius
Young's Modulus
天然存在比
地殻中における存在比na
宇宙空間における存在比na
Db ドブニウム 105 (268) 5 7 d 105 [Rn] 5f14 6d3 7s2 2 8 18 32 32 11 2 None Unknown 1 5.56 h 8.33h AlphaEmission TransitionMetal, Metal, Radioactive, Synthetic HA-ni-em Synthetic radioactive metal. It has no significant commercial applications. Made by bombarding californium-249 with a beam of nitrogen-15 eeczRrDoL_M Dubnium
Radium was discovered by Marie Curie and Pierre Curie in 1898.

They extracted the radium compound from a uraninite sample.

Radium was isolated in its metallic state by Marie Curie and André-Louis Debierne in 1910 through the electrolysis of radium chloride by using a mercury cathode and distilling in an atmosphere of hydrogen gas. From the Latin word radius meaning ray 105 1967 Workers at the Nuclear Institute at Dubna, and the University of California, Berkeley, USA. USSR, United States The origin of the name dubnium is the Joint Nuclear Institute at "Dubna", an institute heavily involved in the search for heavy elements

ラジウムの同位体

Standard Atomic Weight

安定同位体

不安定同位体

255Db 256Db 257Db 258Db 259Db 260Db 261Db 262Db 263Db 264Db 265Db 266Db 267Db 268Db 269Db 270Db

Radium is highly radioactive and carcinogenic
Radium imparts a carmine red color to a flame
Radium was formerly used in self-luminous paints for watches, nuclear panels, aircraft switches, clocks, and instrument dials.

Radium chloride was used in medicine to produce radon gas which in turn was used as a cancer treatment.

The isotope 223Ra is currently under investigation for use in medicine as a cancer treatment of bone metastasis.