Radium
Symbol
Ra
Atomic Number
88
Atomic Weight
226.0254
Element Classification
Discovered By
Pierre and Marie Curie-Sklodowska
Discovery Date
1898 (France/Poland)
Name Origin
Latin: radius (ray).
Density (g/cc)
(5.5)
Melting Point (K)
973
Boiling Point (K)
1413
Appearance
Silvery white, radioactive element
Atomic Radius (pm)
n/a
Atomic Volume (cc/mol)
45.0
Covalent Radius (pm)
n/a
Ionic Radius
143 (+2e)
Specific Heat
0.120
Fusion Heat (kJ/mol)
(9.6)
Evaporation Heat (kJ/mol)
(113)
Thermal Conductivity (@25°C W/m K)
(18.6)
Debye Temperature (K)
n/a
Pauling Negativity Number
0.9
First Ionizing Energy (kJ/mol)
509.0
Oxidation States
2
Electronic Configuration
[Rn] 7s2
Lattice Structure
(n/a)
Lattice Constant
n/a
Lattice C/A Ratio
n/a
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