Ununoctium is d'n tiedelike naam van 'n hypothetisch sjemisch element mit es symboal Uuo en 't periodiek nómmer 118.
In juni 2016 kraog 't elemint de naom Oganesson (symbool Og), nao de Russische wetensjapper Joeri Oganessian. 't Is zier bezunder tot 'n elemint nao 'ne nog levende mins weurt geneump. De naom moot nog geformaliseerd weure; dao-euver weurt in november 2016 gestump.
Ununoctium daan wel oganesson vèlt in gróp 18 vaan 't periodiek systeem. Alle lieger eleminte vaan dees gróp zien edelgaze. Toch höbbe kernfysici gooj grun um aon te numme dat oganesson geinen edelgaas is: relativistische effecte zouwe make tot 't väöls te reactief is um daotouw gerekend te weure. Toch heet me veur dit elemint 'ne naom op -on veurgestèld, in lijn mèt de aander eleminte oet dezelfde grop.
Nuclide | Z (p) | N (n) | Isotoapische massa (u) | Halveringstied | Radioactief verval | VP | Kernspin |
---|---|---|---|---|---|---|---|
294Uuo | 118 | 176 | 890 µs | α | 290Lv |
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