Actinium Element Properties, Transition metals Group, Periodic Table of the Elements
Actinium
|
Actinium Element Properties |
 | | General |
| Name | Actinium |
| Symbol | Ac |
| Number | 89 |
| Group Number | 3 |
| Group | Transition metals |
| Block | f |
| Density | 10.07 g/cm3 |
| Atomic Weight | 227 g/mol |
| Atomic Volume | 22.54 cm3/mol |
| Discover | 1899 |
|
| States |
| State | Solid |
| Melting Point | 1323 K |
| Boiling Point | 3471 K |
| Triple Point | Nil |
| Critical Point | Nil |
| Heat of Fusion | 14 kJ/mol |
| Heat of Vaporization | 400 kJ/mol |
|
| Energies |
| First Ionization Energy | 499 kJ/mole |
| Second Ionization Energy | 1170 kJ/mole |
| Third Ionization Energy | Nil |
| Electronegativity | 1.1 |
| Electron Affinity | Nil |
| Specific Heat | Nil |
| Heat Atomization | 385 kJ/mole atoms |
|
| Oxidation and Electrons |
| Shells | 2,8,18,32,18,9,2 |
| Electron Configuration | [Rn] 6d1 7s2 |
| Minimum Oxidation Number | 0 |
| Maximum Oxidation Number | 3 |
| Minimum Common Oxidation Number | 0 |
| Maximum Common Oxidation Number | 3 |
|
| Appearance and Characteristics |
| Crystal Structure | cubic face centered |
| Characteristics | Radioactive |
| Color | silvery-white |
| Uses | thermoelectric power |
| Hardness | Nil |
| Toxicity | None |
|
| Reactions |
| Reaction with Air | mild, w/ht, =>Ac2O3 |
| Reaction with 6M HCl | mild, =>H2, AcCl3 |
| Reaction with 15M HNO3 | mild, =>Ac(NO3)3 |
| Reaction with 6M NaOH | None |
|
| Other Forms |
| Number of Isotopes | 2 |
| Hydride | AcH2 |
| Oxide | Ac2O3 |
| Chloride | AcCl3 |
|
| Radius |
| Atomic Radius | Nil |
| Ionic Radius (1+ ion) | Nil |
| Ionic Radius (1- ion) | Nil |
| Ionic Radius (2+ ion) | Nil |
| Ionic Radius (2- ion) | Nil |
| Ionic Radius (3+ ion) | 126 pm |
|
| Conductivity |
| Thermal Conductivity | Nil |
| Electrical Conductivity | Nil |
| Polarizability | 32.1 A3 |
|
| Abundance |
| Source | Synthetic(U-235 decay) |
| Relation Abundance Solar System | Nil |
| Abundance Earth's Crust | -9.3 log |
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