پروميتيوم (په انگرېزي: Promethium) له کیمیاوي عناصرو څخه یو دی چې په تناوبي جدول کې د Pm سمبول او ۶۱ اتمي شمېرې په وسیله ښودل شوی دی.
Promethium, 61PmSpectral lines of promethium |
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Pronunciation | /proʊ-ˈmiːθiəm/ pro-MEE-thee-əm |
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Appearance | metallic |
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اټومي شمیره (Z) | 61 |
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گروپ, پیریود | group n/a, period 6 |
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بلاک | f-block |
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Element category | lanthanide |
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Mass number | 145 (most stable isotope) |
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Electron configuration | [Xe] 4f5 6s2 |
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Electrons per shell | 2, 8, 18, 23, 8, 2 |
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حالت (at STP) | جامد |
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دويلې کيدو ټکى | 1315 K (1042 °C, 1908 °F) |
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يشنا ټکی | 3273 K (3000 °C, 5432 °F) |
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Density near r.t. | 7.26 g/cm3 |
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Heat of fusion | 7.13 kJ/mol |
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Heat of vaporization | 289 kJ/mol |
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Oxidation states | 3, 2 (a mildly basic oxide) |
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Electronegativity | Pauling scale: 1.13 (?) |
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Ionization energies | - 1st: 540 kJ/mol
- 2nd: 1050 kJ/mol
- 3rd: 2150 kJ/mol
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Atomic radius | empirical: 183 pm |
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Covalent radius | 199 pm |
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Crystal structure | double hexagonal close-packed (dhcp) |
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Thermal expansion | 9.0 µm/(m·K)[۱] (at r.t.) |
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د تودوخې تېرېدنه | 17.9 W/(m·K) |
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Electrical resistivity | est. 0.75 µΩ·m (at r.t.) |
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Magnetic ordering | paramagnetic[۲] |
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Young's modulus | α form: est. 46 GPa |
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Shear modulus | α form: est. 18 GPa |
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Bulk modulus | α form: est. 33 GPa |
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Poisson ratio | α form: est. 0.28 |
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CAS Number | 7440-12-2 |
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Discovery | Chien Shiung Wu, Emilio Segrè, Hans Bethe (1942) |
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First isolation | Charles D. Coryell, Jacob A. Marinsky, Lawrence E. Glendenin, Harold G. Richter (1945) |
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Named by | Grace Mary Coryell (1945) |
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| references | in Wikidata |