Elements with unconfirmed characteristics
This category includes superheavy elements whose chemical properties have not yet been experimentally investigated. Due to extremely short lifetimes and synthesis difficulty, their properties are only predicted theoretically.
Some superheavy elements exist only milliseconds after synthesis
Oganesson (Og) is named after a living scientist — Yuri Oganessian
'Island of stability' is a hypothetical region with long-lived superheavy elements
Predictions suggest oganesson might be a solid noble gas
Most superheavy elements were synthesized in Dubna (Russia) and Darmstadt (Germany)
Electron configurations of superheavy elements are predicted based on relativistic quantum chemical calculations. Relativistic effects significantly influence their properties.
Chemical reactivity is unknown due to lack of experimental data. Theoretical models predict unusual properties due to relativistic effects.
| Element | Z | Mass u | M.P. °C | B.P. °C | ρ г/см³ | EN |
|---|
The category 'unknown properties' applies to elements whose chemistry has not been experimentally investigated. These elements are classified by theoretical predictions, which may change with new data.
Joint JINR (Dubna) and LLNL team synthesized element 118
IUPAC approved names for elements 113, 115, 117, 118
Synthesized the heaviest elements, element 118 named in his honor