Radium Element Properties, Alkali earth metals Group, Periodic Table of the Elements
Radium
|
Radium Element Properties |
 | | General |
| Name | Radium |
| Symbol | Ra |
| Number | 88 |
| Group Number | 2 |
| Group | Alkali earth metals |
| Block | s |
| Density | 5 g/cm3 |
| Atomic Weight | 226.0254 g/mol |
| Atomic Volume | 45.20 cm3/mol |
| Discover | 1898 |
|
| States |
| State | Solid |
| Melting Point | 973 K |
| Boiling Point | 2010 K |
| Triple Point | Nil |
| Critical Point | Nil |
| Heat of Fusion | 8.5 kJ/mol |
| Heat of Vaporization | 113 kJ/mol |
|
| Energies |
| First Ionization Energy | 509.4 kJ/mole |
| Second Ionization Energy | 979.1 kJ/mole |
| Third Ionization Energy | Nil |
| Electronegativity | 0.9 |
| Electron Affinity | Nil |
| Specific Heat | 0.12 J/gK |
| Heat Atomization | 159 kJ/mole atoms |
|
| Oxidation and Electrons |
| Shells | 2,8,18,32,18,8,2 |
| Electron Configuration | [Rn] 7s2 |
| Minimum Oxidation Number | 0 |
| Maximum Oxidation Number | 2 |
| Minimum Common Oxidation Number | 0 |
| Maximum Common Oxidation Number | 2 |
|
| Appearance and Characteristics |
| Crystal Structure | cubic body centered |
| Characteristics | Radioactive, luminescent |
| Color | white |
| Uses | neutron source |
| Hardness | Nil |
| Toxicity | None |
|
| Reactions |
| Reaction with Air | vigorous, =>RaO2, Ra3N2 |
| Reaction with 6M HCl | None |
| Reaction with 15M HNO3 | None |
| Reaction with 6M NaOH | None |
|
| Other Forms |
| Number of Isotopes | 4 |
| Hydride | None |
| Oxide | None |
| Chloride | RaCl2 |
|
| Radius |
| Atomic Radius | Nil |
| Ionic Radius (1+ ion) | Nil |
| Ionic Radius (1- ion) | Nil |
| Ionic Radius (2+ ion) | 162 pm |
| Ionic Radius (2- ion) | Nil |
| Ionic Radius (3+ ion) | Nil |
|
| Conductivity |
| Thermal Conductivity | 18.6 J/m-sec-deg |
| Electrical Conductivity | Nil |
| Polarizability | 38.3 A3 |
|
| Abundance |
| Source | pitchblende(U-238 decay) |
| Relation Abundance Solar System | Nil |
| Abundance Earth's Crust | -6 log |
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