#88
Radium
alkaline earth metal· Solid·226 u
Radium is a chemical element with symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is almost colorless, but it readily combines with nitrogen (rather than oxygen) on exposure to air, forming a black surface layer of radium nitride (Ra3N2).
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Identity
- Symbol
- Ra
- Atomic Number
- 88
- Atomic Mass
- 226 u
- Category
- alkaline earth metal
- Block
- s-block
- Period
- 7
- Group
- 2
- Appearance
- silvery white metallic
- Year Discovered
- 1898 CE
- Discovered By
- Pierre Curie
- Named By
- radioactivity
Electrons
- Configuration
- [Rn] 7s2
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2
- Shells
- 2, 8, 18, 32, 18, 8, 2
- Electronegativity
- 0.9
- Electron Affinity
- 9.6485
- Oxidation States
- +2
- Ionization Energies
- 509.3, 979
Physical Properties
- State at
- Solid
- Melting Point
- 1233
- Boiling Point
- 2010
- Density
- 5.5
- Crystal Structure
- BCC
- Magnetic Ordering
- Paramagnetic
Mechanical
- Covalent Radius
- 221 pm
- Van der Waals
- 283 pm
- Metallic Radius
- 220 pm
Thermal & Electrical
- Thermal Conductivity
- 18.6 W/(m K) W/(m·K)
- Specific Heat
- 92 J/(kg K) J/(g·K)
- Heat of Vaporization
- 113 kJ/mol kJ/mol
- Heat of Fusion
- 8.5 kJ/mol kJ/mol
Abundance
- Universe
- 0
- Sun
- 0
- Meteorite
- 0
- Earth's Crust
- 9e-7 ppm
- Ocean
- 8.9e-11 ppm
- Human Body
- 1e-10 ppm