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Pronunciation | (TEN-ə-seen) |
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Appearance | semimetallic (predicted) |
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Mass number | 294 (most stable isotope) |
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Atomic number (Z) | 117 |
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Group | group 17 |
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Period | period 7 |
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Block | p-block |
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Element category | unknown chemical properties, but probably a post-transition metal |
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Electron configuration | [Rn] 5f14 6d10 7s2 7p5 (predicted) |
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Electrons per shell | 2, 8, 18, 32, 32, 18, 7 (predicted) |
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Phase at STP | Ts: Unknown phase (predicted) |
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Melting point | 623–823 K (350–550 °C, 662–1022 °F) (predicted) |
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Boiling point | 883 K (610 °C, 1130 °F) (predicted) |
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Density (near r.t.) | 7.1–7.3 g/cm3 (extrapolated) |
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Oxidation states | (−1), (+1), (+3), (+5) (predicted) |
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Ionization energies | - 1st: 742.9 kJ/mol (predicted)
- 2nd: 1435.4 kJ/mol (predicted)
- 3rd: 2161.9 kJ/mol (predicted)
- (more)
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Atomic radius | empirical: 138 pm (predicted) |
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Covalent radius | 156–157 pm (extrapolated) |
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Natural occurrence | Ts: Synthetic |
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CAS Number | 54101-14-3 |
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Naming | after Tennessee region |
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Discovery | Joint Institute for Nuclear Research, Lawrence Livermore National Laboratory, Vanderbilt University and Oak Ridge National Laboratory (2009) |
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| references |