Protactinium Element Properties, Rare Earth, Actinides Group, Periodic Table of the Elements
Protactinium
|
Protactinium Element Properties |
 | | General |
| Name | Protactinium |
| Symbol | Pa |
| Number | 91 |
| Group Number | NA |
| Group | Rare Earth, Actinides |
| Block | f |
| Density | 15.4 g/cm3 |
| Atomic Weight | 231.0359 g/mol |
| Atomic Volume | 15.0 cm3/mol |
| Discover | 1917 |
|
| States |
| State | Solid |
| Melting Point | 1841 K |
| Boiling Point | 4300 K |
| Triple Point | Nil |
| Critical Point | Nil |
| Heat of Fusion | 12.34 kJ/mol |
| Heat of Vaporization | 481 kJ/mol |
|
| Energies |
| First Ionization Energy | 568 kJ/mole |
| Second Ionization Energy | Nil |
| Third Ionization Energy | Nil |
| Electronegativity | 1.5 |
| Electron Affinity | Nil |
| Specific Heat | 0.12 J/gK |
| Heat Atomization | 527 kJ/mole atoms |
|
| Oxidation and Electrons |
| Shells | 2,8,18,32,20,9,2 |
| Electron Configuration | [Rn] 5f2 6d1 7s2 |
| Minimum Oxidation Number | 0 |
| Maximum Oxidation Number | 5 |
| Minimum Common Oxidation Number | 0 |
| Maximum Common Oxidation Number | 5 |
|
| Appearance and Characteristics |
| Crystal Structure | orthorhombic |
| Characteristics | Radioactive |
| Color | silvery |
| Uses | Nil |
| Hardness | Nil |
| Toxicity | None |
|
| Reactions |
| Reaction with Air | None |
| Reaction with 6M HCl | None |
| Reaction with 15M HNO3 | None |
| Reaction with 6M NaOH | None |
|
| Other Forms |
| Number of Isotopes | 1 |
| Hydride | PaH3 |
| Oxide | PaO PaO2 Pa2O5 |
| Chloride | PaCl4 PaCl5 |
|
| Radius |
| Atomic Radius | 163 pm |
| Ionic Radius (1+ ion) | Nil |
| Ionic Radius (1- ion) | Nil |
| Ionic Radius (2+ ion) | Nil |
| Ionic Radius (2- ion) | Nil |
| Ionic Radius (3+ ion) | 118 pm |
|
| Conductivity |
| Thermal Conductivity | Nil |
| Electrical Conductivity | Nil |
| Polarizability | 25.4 A3 |
|
| Abundance |
| Source | Synthetic(U-235 decay) |
| Relation Abundance Solar System | Nil |
| Abundance Earth's Crust | -5.9 log |
|
|
| 
