Oganesson

Koushik 26/06/2026 19:58:09 Updated 26/06/2026 19:58:09

Property	Value
Atomic Number	118
Element	Oganesson
Symbol	Og
Atomic Mass	[294] (most stable isotope)
Number of Neutrons	176 (Oganesson-294)
Number of Protons	118
Number of Electrons	118
Period	7
Group	18
Phase	Unknown (predicted to be solid or possibly gas with unusual behavior)
Radioactive	Yes
Natural	No (synthetic element)
Metal	Unknown
Nonmetal	Unknown (may not behave like typical noble gases)
Metalloid	Unknown
Type	Noble Gas (superheavy, with anomalous properties)
Atomic Radius	— (not well established)
Electronegativity	— (not well established)
First Ionization Energy	~9.0 eV (estimated)
Density	~5 g/cm³ (estimated)
Melting Point	— (not well established)
Boiling Point	~80 °C (estimated)
Number of Isotopes	No stable isotopes (Og-294 most notable)
Discoverer	Joint Institute for Nuclear Research (Dubna) and Lawrence Livermore National Laboratory
Year	2002
Specific Heat	— (not well established)
Number of Shells	7
Number of Valence Electrons	8