โพรมิเทียม
| Group | f-block groups (no number) |
|---|---|
| Boiling point | 3273 K (3000 °C, 5432 °F) |
| Phase at STP | solid |
| Electronegativity | Pauling scale: 1.13 (?) |
| Heat of fusion | 7.13 kJ/mol |
| Young's modulus | α form: est. 46 GPa |
| Ionization energies |
|
| Heat of vaporization | 289 kJ/mol |
| Thermal conductivity | 17.9 W/(m⋅K) |
| Electron configuration | [Xe] 4f5 6s2 |
| Crystal structure | double hexagonal close-packed (dhcp) |
| Shear modulus | α form: est. 18 GPa |
| Pronunciation | /proʊˈmiːθiəm/ (proh-MEE-thee-əm) |
| Magnetic ordering | paramagnetic[2] |
| Oxidation states | +2, +3 (a mildly basic oxide) |
| Discovery | ชาร์ล ดี. คอร์เยล, เจคอบ เอ. มารินสกี, ลอว์เรนซ์ อี. เกรนเดนิน (1945) |
| Period | period 6 |
| Named by | เกรซ แมรี่ คอร์เยล (1945) |
| Atomic radius | empirical: 183 pm |
| CAS Number | 7440-12-2 |
| Electrons per shell | 2, 8, 18, 23, 8, 2 |
| Appearance | มันวาว |
| Thermal expansion | 9.0 µm/(m⋅K)[1] (at r.t.) |
| Natural occurrence | from decay |
| Electrical resistivity | est. 0.75 µΩ⋅m (at r.t.) |
| Poisson ratio | α form: est. 0.28 |
| Mass number | [145] |
| Density (near r.t.) | 7.26 g/cm3 |
| Block | f-block |
| Covalent radius | 199 pm |
| Melting point | 1315 K (1042 °C, 1908 °F) |
| Bulk modulus | α form: est. 33 GPa |
