Oganesson is a superhivy airtifeecial chemical element wi an atomic nummer o 118 an a seembol o Og.
Quick facts Pronunciation, Alternative names ...
Oganesson, 118Og| Oganesson |
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| Pronunciation | (OH-gə-NES-ən[1]) |
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| Alternative names | element 118, eka-radon |
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| Mass number | [294] |
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| Oganesson in the periodic cairt |
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|
Rn
↑
Og
↓
(Usb) |
| tennessine ← oganesson → ununennium |
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| Atomic nummer (Z) | 118 |
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| Group | group 18 |
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| Period | period 7 |
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| Block | p-block |
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| Element category | Unkent chemical properties |
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| Electron confeeguration | [Rn] 5f14 6d10 7s2 7p6 (predictit)[2][3] |
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| Electrons per shell | 2, 8, 18, 32, 32, 18, 8 (predictit) |
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| Pheesical properties |
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| Phase at STP | solit (predicted)[2] |
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| Bylin pynt | 350±30 K (80±30 °C, 170±50 °F) (extrapolatit)[2] |
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| Density when liquid (at m.p.) | 4.9–5.1 g/cm3 (predictit)[4] |
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| Creetical pynt | 439 K, 6.8 MPa (extrapolatit)[5] |
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| Heat o fusion | 23.5 kJ/mol (extrapolatit)[5] |
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| Heat o vapourisation | 19.4 kJ/mol (extrapolatit)[5] |
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| Atomic properties |
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| Oxidation states | (−1),[3] (0), (+1),[6] (+2),[7] (+4),[7] (+6)[3] (predicted) |
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| Ionisation energies | - 1st: 839.4 kJ/mol (predictit)[3]
- 2nd: 1563.1 kJ/mol (predictit)[8]
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| Covalent radius | 157 pm (predictit)[9] |
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| Ither properties |
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| Naitural occurrence | synthetic |
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| CAS Nummer | 54144-19-3[10] |
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| History |
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| Namin | IUPAC seestematic element name |
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| Diskivery | Jynt Institute for Nuclear Research an Lawrence Livermore Naitional Laboratory (2002) |
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| Main isotopes o oganesson |
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| | references |
Close
It wis recognised bi the International Union of Pure and Applied Chemistry in Januar 2016. It is cried efter Yuri Oganessian, a Russian physicist that wis ahint the discovery o flerovium.[12]