Ununoctium
Ununoctium is the temporary IUPAC name for the transactinide element having the atomic number 118 and temporary element symbol Uuo. On the periodic table of the elements, it is a p-block element and the last one of the 7th period. Ununoctium is currently the only synthetic member of group 18 and has the highest atomic number and highest atomic mass assigned to a discovered element.
| General | |
|---|---|
| Name, symbol, number | Ununoctium, Uuo, 118 |
| Chemical series | noble gases |
| Group, period, block | 18, 7, p |
| Appearance | Unknown, probably colorless |
| Standard atomic weight | (294)g·mol-1 |
| Electrons per shell | 2, 8, 18, 32, 32, 18, 8 |
| Physical properties | |
| Phase | liquid (or solid – predicted) |
| Density (near r.t.) | (predicted) 13.65 g·cm−3 |
| Boiling point | (extrapolated) 320–380 K (50–110 °C, 120–220 °F) |
| Critical point | (extrapolated) 439 K, 6.8 MPa |
| Heat of fusion | (extrapolated) 23.5 kJ·mol-1 |
| Heat of vaporization | (extrapolated) 19.4 kJ·mol-1 |
| Oxidation states | 0, +2, +4 |
| Ionization energies | 1st: (calc.) 820–1130 kJ·mol-1 |
| 2nd: (extrapolated) 1450 kJ·mol-1 | |
| Atomic radius | (predicted) 152 pm |
| Covalent radius | (extrapolated) 230 pm |
| Miscellaneous | |
| CAS registry number | 54144-19-3 |
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