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Pronunciation | (RUDH-ər-FOR-dee-əm) |
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Mass number | [267] |
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Atomic number (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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Electron configuration | [Rn] 5f14 6d2 7s2[1][2] |
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Electrons per shell | 2, 8, 18, 32, 32, 10, 2 |
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Phase at STP | solid (predicted)[1][2] |
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Melting point | 2400 K (2100 °C, 3800 °F) (predicted)[1][2] |
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Boiling point | 5800 K (5500 °C, 9900 °F) (predicted)[1][2] |
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Density (near r.t.) | 17 g/cm3 (predicted)[3][4] |
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Oxidation states | (+2), (+3), +4[1][2][5] (parenthesized: prediction) |
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Ionization energies | - 1st: 580 kJ/mol
- 2nd: 1390 kJ/mol
- 3rd: 2300 kJ/mol
- (more) (all but first estimated)[2]
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Atomic radius | empirical: 150 pm (estimated)[2] |
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Covalent radius | 157 pm (estimated)[1] |
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Natural occurrence | synthetic |
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Crystal structure | hexagonal close-packed (hcp) (predicted)[6] |
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CAS Number | 53850-36-5 |
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Naming | after Ernest Rutherford |
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Discovery | Joint Institute for Nuclear Research and Lawrence Berkeley National Laboratory (1964, 1969) |
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Category: Rutherfordium | references |