| دوتنه:Actinium.jpg |
| عمومي خواص |
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| Pronunciation | /ækˈtɪniəm/
ak-TIN-nee-əm |
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| Appearance | silvery-white, glowing with an eerie blue light;[۱] sometimes with a golden cast[۲] |
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| Actinium پهدوراني جدول کې |
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| اټومي شمیره(Z) | 89 |
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| گروپ,پیریود | group 3,period 7 |
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| بلاک | d-block |
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| Element category | actinide, sometimes considered atransition metal |
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| Mass number | 227 (most stable isotope) |
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| Electron configuration | [Rn] 6d1 7s2 |
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Electrons per shell | 2, 8, 18, 32, 18, 9, 2 |
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| فزیکي خواص |
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| حالت(at STP) | جامد |
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| دويلې کيدو ټکى | 1500 K (1227 °C, 2240 °F) (estimated)[۲] |
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| يشنا ټکی | 3500±300 K (3200±300 °C, 5800±500 °F) (extrapolated)[۲] |
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| Density near r.t. | 10 g/cm3 |
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| Heat of fusion | 14 kJ/mol |
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| Heat of vaporization | 400 kJ/mol |
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| Molar heat capacity | 27.2 J/(mol·K) |
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| اټومي خواص |
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| Oxidation states | 3, 2 (a neutral oxide) |
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| Electronegativity | Pauling scale: 1.1 |
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| Ionization energies | - 1st: 499 kJ/mol
- 2nd: 1170 kJ/mol
- 3rd: 1900 kJ/mol
- (more)
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| Covalent radius | 215 pm |
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| Miscellanea |
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| Crystal structure | face-centered cubic (fcc) Face-centered cubic crystal structure for actinium |
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| د تودوخې تېرېدنه | 12 W/(m·K) |
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| CAS Number | 7440-34-8 |
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| History |
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| Discovery and first isolation | Friedrich Oskar Giesel (1902) |
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| Named by | André-Louis Debierne (1899) |
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| Mainisotopes of actinium |
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| | references | in Wikidata |
