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Holmium(Ho) | Lutetium(Lu) | Neodymium(Nd) | Praseodymium(Pr) | Promethium(Pm) |
|---|---|---|---|---|---|
| Atomic weight | 164.93 | 174.96 | 144.24 | 140.908 | ... |
| Atomic volume | 18.7 (cm3/mol) | 17.78 (cm3/mol) | 20.6 (cm3/mol) | 20.8 (cm3/mol) | 22.39 (cm3/mol) |
| discovered | 11/30/1878 | 11/30/1906 | 11/30/1884 | 11/30/1884 | 11/30/1944 |
| state (s, l, g) | s | s | s | s | s |
| melting point | 1,743.2 (K) | 1,929.2 (K) | 1,283.2 (K) | 1,204.2 (K) | 1,353.2 (K) |
| boiling point | 2,873 (K) | 3,600 (K) | 3,300 (K) | 3,293 (K) | ... |
| electronegativity | 1.23 | 1.27 | 1.14 | 1.13 | 1.15 |
| electron affinity | 50 (kJ/mole) | 50 (kJ/mole) | 50 (kJ/mole) | 50 (kJ/mole) | 50 (kJ/mole) |
| Shells | 2,8,18,29,8,2 | 2,8,18,32,9,2 | 2,8,18,22,8,2 | 2,8,18,21,8,2 | 2,8,18,23,8,2 |
| electron configuration | [Xe] 4f11 6s2 | [Xe] 4f14 5d1 6s2 | [Xe] 4f4 6s2 | [Xe] 4f3 6s2 | [Xe] 4f5 6s2 |
| structure | hcp: hexagonal close pkd | hcp: hexagonal close pkd | cp: close packed (ABCB) | cp: close packed (ABCB) | cp: close packed (ABCB) |
| uses | alloys | alloys | alloys, Welder's mask | alloys, Welder's mask | nuclear battery |
| characteristics | ... | ... | ... | soft | Radioactive |
| reaction with air | vigorous, =>Ho2O3 | vigorous, =>Lu2O3 | vigorous, w/ht =>Nd2O3 | vigorous, =>Pr6O11 approx | vigorous, =>Pm2O3 |
| number of isotopes | 1 | 2 | 7 | 1 | |
| hydride(s) | HoH2 HoH3 | LuH2 LuH3 | NdH2 NdH3 | PrH2 PrH3 | ... |
| oxide(s) | Ho2O3 | Lu2O3 | Nd2O3 | PrO2 Pr6O11 | Pm2O3 |
| chloride(s) | HoCl3 | LuCl3 | NdCl2 NdCl3 | PrCl3 | ... |
| image |  |  |  |  |  |
| thermal conductivity | 16.2 J/m-sec-deg | 16.4 J/m-sec-deg | 16.5 J/m-sec-deg | 12.5 J/m-sec-deg | 17.9 J/m-sec-deg |
| electrical conductivity | 11.4 1/mohm-cm | 16.7 1/mohm-cm | 15.4 1/mohm-cm | 14.706 1/mohm-cm | 1/mohm-cm |
| polarizability | 23.6 (A^3) | 21.9 (A^3) | 31.4 (A^3) | 28.2 (A^3) | 30.1 (A^3) |
| source | Monazite(phosphate),bastnaesite | Monazite(phosphate),bastnaesite | Monazite(phosphate),bastnaesite | Monazite(phosphate),bastnaesite | Synthetic |
| abundance earth's crust | .1 (log) | -0.3 (log) | 1.4 (log) | .9 (log) | -19.3 (log) |
| cost, pure | 740 $/100g | 6900 $/100g | 110 $/100g | 170 $/100g | $/100g |
| cost, bulk | $/100g | $/100g | $/100g | $/100g | $/100g |
| rel. abund. solar system | - (-) | - (-) | - (-) | - (-) | l (l) |
| Density @ 293 K | 8 (8) | 9 (9) | 7 (7) | 6 (6) | 6 (6) |
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