Holmium Element Properties, Rare Earth, Lanthanides Group, Periodic Table of the Elements
Holmium
|
Holmium Element Properties |
 | | General |
| Name | Holmium |
| Symbol | Ho |
| Number | 67 |
| Group Number | NA |
| Group | Rare Earth, Lanthanides |
| Block | f |
| Density | 8.80 g/cm3 |
| Atomic Weight | 164.9304 g/mol |
| Atomic Volume | 18.7 cm3/mol |
| Discover | 1879 |
|
| States |
| State | Solid |
| Melting Point | 1734 K |
| Boiling Point | 2993 K |
| Triple Point | Nil |
| Critical Point | Nil |
| Heat of Fusion | 17.0 kJ/mol |
| Heat of Vaporization | 265 kJ/mol |
|
| Energies |
| First Ionization Energy | 580.7 kJ/mole |
| Second Ionization Energy | 1139 kJ/mole |
| Third Ionization Energy | 2204 kJ/mole |
| Electronegativity | 1.23 |
| Electron Affinity | 50 kJ/mole |
| Specific Heat | 0.16 J/gK |
| Heat Atomization | 301 kJ/mole atoms |
|
| Oxidation and Electrons |
| Shells | 2,8,18,29,8,2 |
| Electron Configuration | [Xe] 4f11 6s2 |
| Minimum Oxidation Number | 0 |
| Maximum Oxidation Number | 3 |
| Minimum Common Oxidation Number | 0 |
| Maximum Common Oxidation Number | 3 |
|
| Appearance and Characteristics |
| Crystal Structure | hexagonal |
| Characteristics | None |
| Color | silvery-white |
| Uses | alloys |
| Hardness | Nil |
| Toxicity | None |
|
| Reactions |
| Reaction with Air | vigorous, =>Ho2O3 |
| Reaction with 6M HCl | mild, =>H2, HoCl3 |
| Reaction with 15M HNO3 | mild, =>Ho(NO3)3 |
| Reaction with 6M NaOH | None |
|
| Other Forms |
| Number of Isotopes | 1 |
| Hydride | HoH2 HoH3 |
| Oxide | Ho2O3 |
| Chloride | HoCl3 |
|
| Radius |
| Atomic Radius | 176 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) | 104.1 pm |
|
| Conductivity |
| Thermal Conductivity | 16.2 J/m-sec-deg |
| Electrical Conductivity | 11.4 1/mohm-cm |
| Polarizability | 23.6 A3 |
|
| Abundance |
| Source | Monazite(phosphate),bastnaesite |
| Relation Abundance Solar System | -1.051 log |
| Abundance Earth's Crust | 0.1 log |
|
|
| 
