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CAS Number53850-35-4
PubChem CIDna
Rază atomică-
Volum molar-
Masă atomică[268]
Blocd
Punct de fierbere-
Bulk Modulus
CategorieMetale de tranziție
Structură cristalină
Culoare
Rază de covalență149
Densitate39
Electrical Resistivity
Configurație electronică[Rn] 5f14 6d3 7s2
Electroni pe nivelul de energie2, 8, 18, 32, 32, 11, 2
Electronegativitate-
Electrons105
Grupă5
Energie de fuziunena
Energie de evaporarena
Potențial de ionizare-
Magnetic Ordering
Magnetic Susceptibility
Masa[268]
Mass Number105
Punct de topire-
NumeDubniu
Neutroni157
Număr atomic262
Număr de oxidare5
Perioadă7
FazăSolid
Poisson Ratio
Protoni105
Shear Modulus
Căldură specifică-
SimbolDb
Conductivitate termică0,58
Van der Waals radius
Young's Modulus
Abundență naturală
Abundența în scoarța Pământuluina
Abundența în Universna
Db Dubniu 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. Din cuvântul latin radius, însemnând rază 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

Isotopes of Radium

Standard Atomic Weight

Izotopi stabili

Izotopi instabili

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.