 |
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) |
|