Rutherfordium, 104RfRutherfordium |
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Pronunciation | i (RUDH-ər-FOR-dee-əm) |
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Mass number | [267] |
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Rutherfordium in the periodic cairt |
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Hf ↑ Rf ↓ (Uph)
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lawrencium ← rutherfordium → dubnium
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Atomic nummer (Z) | 104 |
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Group | group 4 |
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Period | period 7 |
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Block | d-block |
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Element category | Transeetion metal |
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Electron confeeguration | [Rn] 5f14 6d2 7s2[1][2] |
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Electrons per shell | 2, 8, 18, 32, 32, 10, 2 |
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Pheesical properties |
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Phase at STP | solit (predictit)[3][2] |
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Meltin pynt | 2400 K (2100 °C, 3800 °F) (predictit)[3][2] |
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Bylin pynt | 5800 K (5500 °C, 9900 °F) (predictit)[3][2] |
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Density (near r.t.) | 23.2 g/cm3 (predictit)[3][2][4] |
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Atomic properties |
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Oxidation states | (+2), (+3), +4[1][2][4] (Template:Engvar: prediction) |
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Ionisation energies | - 1st: 579.9 kJ/mol
- 2nd: 1389.4 kJ/mol
- 3rd: 2296.4 kJ/mol
- (more) (all estimated)[2]
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Atomic radius | empirical: 150 pm (estimatit)[2] |
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Covalent radius | 157 pm (estimatit)[3] |
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Ither properties |
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Naitural occurrence | synthetic |
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Creestal structur | hexagonal close-packed (hcp) (predicted)[5] |
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CAS Nummer | 53850-36-5 |
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History |
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Namin | after Ernest Rutherford |
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Diskivery | Jynt Institute for Nuclear Research (1964) |
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Main isotopes o rutherfordium |
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Isotope
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Abundance
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Hauf-life (t1/2)
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Decay mode
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Product
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261Rf
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syn
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70 s[6]
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>80% α
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257No
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<15% ε
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261Lr
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<10% SF
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263Rf
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syn
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15 min[6]
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<100% SF
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~30% α
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259No
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265Rf
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syn
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1.0+1.2 −0.3 min[7][8][9]
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SF
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266Rf?
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syn
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10? h
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SF?/α?
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267Rf
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syn
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1.3 h[6]
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SF
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268Rf?
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syn
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6? h
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SF?/α?
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| references |
Rutherfordium is a chemical element wi symbol Rf an atomic nummer 104, named tae gie mense tae physicist Ernest Rutherford.