Svojstva

CAS broj53850-35-4
PubChem CIDna
Atomski radijus-
Atomski volumen-
Relativna atomska masa[268]
Blokd
Vrelište-
Modul stišljivosti
KategorijaPrijelazni metali
Kristalna struktura
Boja
Kovalentni radijus149
Gustoća39
Električna otpornost
Elektronska konfiguracija[Rn] 5f14 6d3 7s2
Elektrona po ljusci2, 8, 18, 32, 32, 11, 2
Elektronegativnost-
Elektroni105
Skupina5
Toplina taljenjana
Toplina isparavanjana
Potencijal ionizacije-
Magnetsko redanje
Magnetska osjetljivost
Masa[268]
Maseni broj105
Talište-
NazivDubnij
Neutroni157
Atomski broj262
Stanja oksidacije5
Perioda7
Agregacijsko stanjeČvrsto
Poissonov omjer
Protoni105
Modul smicanja
Specifični toplinski kapacitet-
SimbolDb
Toplinska vodljivost0,58
Van der Waalsov radijus
Youngov modul
Obilnost
Zastupljenost u Zemljinoj korina
Zastupljenost u svemiruna
Db Dubnij 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. Od latinske riječi radius, zraka 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

Stabilni izotopi

Nestabilni izotopi

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.