CAS Number53850-35-4
PubChem CIDna
Atomic Radius-
Atomic Volume-
परमाणु भार[268]
Bulk Modulus
श्रेणीसंक्रमण धातु
Crystal Structure
संयोजी त्रिज्या149
Electrical Resistivity
इलेक्ट्रॉन कॉन्फिगरेशन[Rn] 5f14 6d3 7s2
इलेक्ट्रॉन प्रति शेल2, 8, 18, 32, 32, 11, 2
विलय ऊष्माna
वाष्पीकरण ऊष्माna
आयनीकरण ऊर्जाएं-
Magnetic Ordering
Magnetic Susceptibility
Mass Number105
परमाणु संख्या262
ऑक्सीकरण स्थितियां5
Poisson Ratio
Shear Modulus
विशिष्ट ऊष्मा क्षमता-
तापीय चालकता0.58
Van der Waals radius
Young's Modulus
प्राकृतिक प्रचुरता
Abundance in Earth's crustna
Abundance in Universena
Db डब्नियम 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.