Radium

Radium (Ra)

Radioactive metallic transuranic element, belongs to group 2 of the periodic table. Most stable isotope, Ra-226 has a half-life of 1602 years, which decays into radon. Isolated from pitchblende in 1898 Marie and Pierre Curie.
Atomic Number88
Atomic Weight226
Mass Number202
Group2
Period7
Blocks
Protons88 p+
Neutrons114 n0
Electrons88 e-
Radium226.jpg Animated Bohr Model Enhanced Bohr Model Bohr Model Orbital Diagram

Properties

Atomic Radius
215 pm
Atomic Volume
Covalent Radius
200.99999999999997 pm
Metallic Radius
Ionic Radius
148 pm
Crystal Radius
162 pm
Van der Waals radius
283 pm
Density
Boiling Point
1,413 K
Melting Point
973 K
Electrons per shell2, 8, 18, 32, 18, 8, 2
Electronegativity
0.9
Electrophilicity
0.6982685447294 eV/particle
Proton Affinity
Electron Affinity
Ionization Potential
5.278424 eV/particle
Heat of Vaporization
113 kJ/mol
Heat of Fusion
9.6 kJ/mol
Heat of Formation
159 kJ/mol
Molar Heat Capacity
Specific Heat Capacity
Thermal Conductivity
Gas Basicity
Dipole Polarizability
246 a₀
C6 Dispersion Coefficient
Oxidation States2
Color
Silver
Crystal StructureBody Centered Cubic ()
Lattice Constant
Bulk Modulus
Electrical Resistivity
Electron Configuration[Rn] 7s2
Magnetic Ordering
Magnetic Susceptibility
PhaseSolid
Poisson Ratio
Shear Modulus
Young's Modulus
Allotropes
Alternate Names
Adiabatic Index
Appearance
Electric Conductivity
Critical Pressure
Critical Temperature
Curie Point
Electrical
Hardness
Magnetic Susceptibility
Magnetic
Neel Point
Neutron Cross Section
Neutron Mass Absorption
Gas Phase
Quantum Numbers
Refractive Index
Space Group
Speed of Sound
Superconducting Point
Thermal Expansion
Valence Electrons
Classification
CategoryAlkaline earth metals, Alkaline earth metals
CAS GroupIIA
IUPAC GroupIIA
Glawe Number13
Mendeleev Number10
Pettifor Number13
Geochemical ClassU/Th decay series
Goldschmidt Classlitophile
Radioactivity
RadioactiveYes ☢️
Decay Mode
Half-Life
Lifetime
Abundance
Abundance in Earth's crust
0.0000009 mg/kg
Abundance in Oceans
0.000000000089 mg/L
Abundance in Human Body
Abundance in Meteor
Abundance in Sun
Abundance in Universena

Isotopes of Radium

Stable Isotopes
Unstable Isotopes
202Ra 203Ra 204Ra 205Ra 206Ra 207Ra 208Ra 209Ra 210Ra 211Ra 212Ra 213Ra 214Ra 215Ra 216Ra 217Ra 218Ra 219Ra 220Ra 221Ra 222Ra 223Ra 224Ra 225Ra 226Ra 227Ra 228Ra 229Ra 230Ra 231Ra 232Ra 233Ra 234Ra

History

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

DiscoverersPierre and Marie Curie
Discovery LocationFrance
Discovery Year1898
Name OriginLatin: radius (ray).
Radium is highly radioactive and carcinogenic
Radium imparts a carmine red color to a flame

Uses

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. Used in treating cancer because of the gamma rays it gives off.

Sources

Found in uranium ores at 1 part per 3 million parts uranium.