 |
| 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 Earths Crust | (-6 log) |
|
