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Radium (Ra) properties


Atomic mass, symbol and atomic number

radium is a naturally occurring element with the element symbol Ra and the atomic number 88. In the periodic table it stands with an atomic mass of 226.02 u in the 2nd main group. The chemical element discovered by the couple Curie 1898 is radioactive and is in a solid state of aggregation at room temperature.

Profile: Radium (English: Radium)

General
Chemical element:radium
Symbol:Ra
Atomic number:88
Group:alkaline earth metal
Period:7
Block:s block
Series:alkaline earth metals
Appearance:silver
explorers:Pierre Curie and Marie Curie
Year of discovery:1898
Atomic properties
Atomic mass:226.02 u
Atomic radius:215 pm
Covalent radius:221 pm
Van der Waals radius:283 pm
Electron configuration:Rn 7s2
ionization:509.3 kJ / mol
Physical Properties
Physical state:firmly
Density:???
Crystal structure:cubic
Magnetism:not magnetic
molar volume:41,09 · 10-6 m3/ mol
Mohs hardness:/
Melting point:700 ° C
Boiling point:1737 ° C
Heat of fusion:8 kJ / mol
Heat of vaporization:125 kJ / mol
Thermal conductivity:19 W
Chemical properties
electronegativity:0,9

Did you know that ...

  • Radium in the group of alkaline earth metals is the only radioactive element?
  • can the name of the element be derived from the radioactive property (lat. radius)?
  • Radium is produced as an intermediate in the decay series of uranium?