Symbol: Ra
Atomic Number: 88
Atomic Weight: 226.0254
Element Classification: Alkaline-earth Metal
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 (@20°C J/g mol): 0.120
Fusion Heat (kJ/mol): (9.6)
Evaporation Heat (kJ/mol): (113)
Thermal Conductivity (@25°C W/m K):
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 (Å): n/a
Lattice C/A Ratio: n/a