Properties

CAS Number53850-35-4
PubChem CIDna
Atomic Radius-
Atomic Volume-
Atomic Weight[268]
Blockd
Boiling Point-
Bulk Modulus
CategoryTransition metals
Crystal Structure
Color
Covalent Radius149
Density39
Electrical Resistivity
Electron Configuration[Rn] 5f14 6d3 7s2
Electrons per shell2, 8, 18, 32, 32, 11, 2
Electronegativity-
Electrons105
Group5
Heat of Fusionna
Heat of Vaporizationna
Ionization Potential-
Magnetic Ordering
Magnetic Susceptibility
Mass[268]
Mass Number105
Melting Point-
NameHahnium
Neutrons157
Atomic Number262
Oxidation States5
Period7
PhaseSolid
Poisson Ratio
Protons105
Shear Modulus
Specific Heat Capacity-
SymbolDb
Thermal Conductivity0.58
Van der Waals radius
Young's Modulus
Abundance
Abundance in Earth's crustna
Abundance in Universena
Db Hahnium 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

Isotopes of Radium

Standard Atomic Weight

Stable Isotopes

Unstable Isotopes

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.