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Chemical element with atomic number 118 (Og)
Oganesson is a synthetic chemical element; it has symbol Og and atomic number 118. It was first synthesized in 2002 at the Joint Institute for Nuclear
Oganesson
Oganesson (118Og) is a synthetic element created in particle accelerators, and thus a standard atomic weight cannot be given. Like all synthetic elements
Isotopes_of_oganesson
Group of low-reactive, gaseous chemical elements
argon (Ar), krypton (Kr), xenon (Xe), radon (Rn) and, in some cases, oganesson (Og). Under standard conditions, the first six of these elements are odorless
Noble_gas
Tabular arrangement of the chemical elements
are known to occur naturally on Earth. The remaining 24, americium to oganesson (95–118), occur only when synthesized in laboratories. Of the 94 naturally
Periodic_table
Periodic table of the elements with eight or more periods
known and proven. The element with the highest atomic number known is oganesson (Z = 118), which completes the seventh period (row) in the periodic table
Extended_periodic_table
Armenian and Russian nuclear physicist (born 1933)
1989 and is now its scientific director. The heaviest known element, oganesson, is named after him, only the second time that an element was named after
Yuri_Oganessian
Prediction in nuclear physics
Nevertheless, the successful synthesis of superheavy elements up to Z = 118 (oganesson) with up to 177 neutrons demonstrates a slight stabilizing effect around
Island_of_stability
Chemical compound containing a noble gas element
available information for these compounds. The radioactive elements radon and oganesson are harder to study and are considered at the end of the section. After
Noble_gas_compound
Abbreviations used in chemistry
ununseptium; Ts, tennessine. 118: Uuo, ununoctium; Og, oganesson. When elements beyond oganesson (starting with ununennium, Uue, element 119), are discovered;
Chemical_symbol
Temporary name assigned to predicted chemical elements
receive once confirmed; thus, elements 117 and 118 are now tennessine and oganesson, respectively. For these trivial names, all elements receive the suffix
Systematic_element_name
Chemical element with atomic number 98 (Cf)
spectroscopy. It can also be used in nuclear synthesis of higher mass elements; oganesson (element 118) was synthesized by bombarding californium-249 atoms with
Californium
Chemical elements with atomic numbers from 104 to 120
higher than expected chemical activity for oganesson (element 118). Named after Yuri Organessian, oganesson is the last known element. The next two elements
Superheavy_element
2025 studio album by Tortoise
March 27, 2025, Tortoise released "Oganesson" as the lead single from Touch. On June 24, 2025, the band released Oganesson Remixes, an EP consisting of the
Touch_(Tortoise_album)
Supplementary information on noble gases
excluded from the main article to conserve space and preserve focus. Oganesson is mostly not included due to the limited amount of known data. Radon
Noble_gas_(data_page)
Bulgarian-American physicist (born 1959)
also claimed the creation of elements 116 and 118 (now livermorium and oganesson); however, an investigation conducted by the University of California
Victor_Ninov
Calendar year
117 and 118 are officially named Nihonium, Moscovium, Tennessine and Oganesson. December 29 – The Helsinki District Court gives Jari Aarnio, the former
2016
Element whose atomic number is greater than 92
Tennessee, the location of Oak Ridge National Laboratory (2010). 118. oganesson, Og, after Yuri Oganessian, who led the JINR team in its discovery of
Transuranium_element
Chemical element with atomic number 117 (Ts)
(praseodymium and propyl). The naming ceremony for moscovium, tennessine, and oganesson was held on 2 March 2017 at the Russian Academy of Sciences in Moscow;
Tennessine
Chemical elements that do not occur naturally
five known elements, flerovium, moscovium, livermorium, tennessine, and oganesson, were created by Russian–American collaborations and complete the seventh
Synthetic_element
Natural number
official name assigned by IUPAC, the last of which (number 118) being oganesson. 118 (disambiguation) Wikimedia Commons has media related to 118 (number)
118_(number)
Chemical element with atomic number 106 (Sg)
elements named after a living person at the time of naming, the other being oganesson, element 118. A superheavy atomic nucleus is created in a nuclear reaction
Seaborgium
Chemical element with atomic number 47 (Ag)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Cu ↑ Ag ↓ Au palladium ← silver → cadmium Atomic number (Z) 47 Group group 11
Silver
Topics referred to by the same term
Royal Engineers 118 Peitho, a main-belt asteroid 11/8 (disambiguation) Oganesson, synthetic chemical element with atomic number 118 This disambiguation
118
American post-rock band
"Galapagos" 2009 – "Prepare Your Coffin" 2016 – "Yonder Blue" 2025 – "Oganesson" 2025 – "Works and Days" 2025 – "Layered Presence" 2025 – "A Title Comes"
Tortoise_(band)
Any element in row 7 of the periodic table
tied for the most with period 6, beginning with francium and ending with oganesson, the heaviest element currently discovered. As a rule, period 7 elements
Period_7_element
Substance that is not chemically reactive
gases (helium, neon, argon, krypton, xenon, radon, and—in some cases—oganesson) were previously known as inert gases because of their perceived lack
Chemically_inert
Gas which does not chemically react under the specified conditions
sample. Generally, nitrogen, carbon dioxide, and all noble gases except oganesson (helium, neon, argon, krypton, xenon, and radon) are considered inert
Inert_gas
Chemical element with atomic number 13 (Al)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson B ↑ Al ↓ Ga magnesium ← aluminium → silicon Atomic number (Z) 13 Group
Aluminium
Chemical element with atomic number 114 (Fl)
stability". This island of stability, supposedly from copernicium (Z = 112) to oganesson (Z = 118), would come after a long "sea of instability" from mendelevium
Flerovium
Number of protons or neutrons that make a nucleus particularly stable
occur for the noble gases helium, neon, argon, krypton, xenon, radon and oganesson. Hence, the "atomic magic numbers" are 2, 10, 18, 36, 54, 86, and 118
Magic_number_(physics)
Chemical element with atomic number 36 (Kr)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Ar ↑ Kr ↓ Xe bromine ← krypton → rubidium Atomic number (Z) 36 Group group 18
Krypton
Type of material
suggests that these uninvestigated elements should be metals, except for oganesson (Og) which DFT calculations indicate would be a semiconductor. Metallic
Metal
Chemical element with atomic number 80 (Hg)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Cd ↑ Hg ↓ Cn gold ← mercury → thallium Atomic number (Z) 80 Group group 12
Mercury_(element)
Chemical element with atomic number 79 (Au)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Ag ↑ Au ↓ Rg platinum ← gold → mercury Atomic number (Z) 79 Group group 11
Gold
Chemical element with atomic number 26 (Fe)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Fe ↓ Ru manganese ← iron → cobalt Atomic number (Z) 26 Group group 8
Iron
Chemical element with atomic number 29 (Cu)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Cu ↓ Ag nickel ← copper → zinc Atomic number (Z) 29 Group group 11
Copper
Chemical element with atomic number 72 (Hf)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Zr ↑ Hf ↓ Rf lutetium ← hafnium → tantalum Atomic number (Z) 72 Group
Hafnium
Chemical element with atomic number 83 (Bi)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Sb ↑ Bi ↓ Mc lead ← bismuth → polonium Atomic number (Z) 83 Group group 15
Bismuth
Chemical element with atomic number 19 (K)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Na ↑ K ↓ Rb argon ← potassium → calcium Atomic number (Z) 19 Group group 1:
Potassium
Chemical element with atomic number 1 (H)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ H ↓ Li (none) ← hydrogen → helium Atomic number (Z) 1 Group group 1:
Hydrogen
Chemical element with atomic number 74 (W)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Mo ↑ W ↓ Sg tantalum ← tungsten → rhenium Atomic number (Z) 74 Group group 6
Tungsten
p-block [294] (7.1–7.3) (700) (883) – – – synthetic unknown phase 118 Og Oganesson 18 7 p-block [294] (7) (325±15) (450±10) – – – synthetic unknown phase
List_of_chemical_elements
Chemical element with atomic number 92 (U)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Nd ↑ U ↓ — protactinium ← uranium → neptunium Atomic number (Z) 92 Group
Uranium
Chemical element with atomic number 16 (S)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson O ↑ S ↓ Se phosphorus ← sulfur → chlorine Atomic number (Z) 16 Group group 16
Sulfur
Chemical substance not composed of simpler ones
other elements. Most recently, the synthesis of element 118 (since named oganesson) was reported in October 2006, and the synthesis of element 117 (tennessine)
Chemical_element
Chemical element with atomic number 33 (As)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson P ↑ As ↓ Sb germanium ← arsenic → selenium Atomic number (Z) 33 Group
Arsenic
Chemical element with atomic number 10 (Ne)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson He ↑ Ne ↓ Ar fluorine ← neon → sodium Atomic number (Z) 10 Group group 18
Neon
Chemical element with atomic number 18 (Ar)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Ne ↑ Ar ↓ Kr chlorine ← argon → potassium Atomic number (Z) 18 Group group 18
Argon
Chemical element with atomic number 94 (Pu)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Sm ↑ Pu ↓ — neptunium ← plutonium → americium Atomic number (Z) 94 Group
Plutonium
has also been observed in the decay of oganesson. In October 2006 it was announced that three atoms of oganesson had been detected by the bombardment of
Isotopes_of_livermorium
Chemical element with atomic number 17 (Cl)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson F ↑ Cl ↓ Br sulfur ← chlorine → argon Atomic number (Z) 17 Group group 17
Chlorine
2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 Og, 118, oganesson : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2
Periodic table (electron configurations)
Periodic_table_(electron_configurations)
Glenn Seaborg, who was alive at the time of naming in 1997; and in 2016 oganesson was named after Yuri Oganessian (still living as of May 2026). Many transuranic
Naming_of_chemical_elements
Chemical element with atomic number 12 (Mg)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Be ↑ Mg ↓ Ca sodium ← magnesium → aluminium Atomic number (Z) 12 Group
Magnesium
Chemical element with atomic number 14 (Si)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson C ↑ Si ↓ Ge aluminium ← silicon → phosphorus Atomic number (Z) 14 Group
Silicon
Theoretical chemical element with atomic number 119 (Uue)
interpreting data have been made. Elements 114 to 118 (flerovium through oganesson) were discovered in "hot fusion" reactions at the Joint Institute for
Ununennium
Index of chemical compounds with the same name
tetrafluoride, NdF4 Neptunium tetrafluoride, NpF4 Niobium tetrafluoride, NbF4 Oganesson tetrafluoride, OgF4 (predicted) Osmium tetrafluoride, OsF4 Palladium tetrafluoride
Tetrafluoride
City in Rostov Oblast, Russia
flerovium, and Yuri Oganessian (a nuclear physicist who is the namesake of oganesson (element 118)). Iosif Vorovich (1920–2001), mathematician, academician
Rostov-on-Don
Chemical element with atomic number 115 (Mc)
28 November 2016. The naming ceremony for moscovium, tennessine, and oganesson was held on 2 March 2017 at the Russian Academy of Sciences in Moscow
Moscovium
Chemical element with atomic number 70 (Yb)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Yb ↓ No thulium ← ytterbium → lutetium Atomic number (Z) 70 Group
Ytterbium
Chemical element with atomic number 99 (Es)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Ho ↑ Es ↓ — californium ← einsteinium → fermium Atomic number (Z) 99 Group
Einsteinium
Chemical element with atomic number 90 (Th)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Ce ↑ Th ↓ — actinium ← thorium → protactinium Atomic number (Z) 90 Group
Thorium
Surname list
Oganessian (born 1933), Russian-Armenian nuclear physicist (the element oganesson is named to honor him) All pages with titles containing Oganessian All
Oganessian
Chemical element with atomic number 56 (Ba)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Sr ↑ Ba ↓ Ra caesium ← barium → lanthanum Atomic number (Z) 56 Group group 2
Barium
Principal energy levels in atomic physics
francium), but they are not complete even at the heaviest known element, oganesson (element 118). The list below gives the elements arranged by increasing
Electron_shell
Chemical element with atomic number 30 (Zn)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Zn ↓ Cd copper ← zinc → gallium Atomic number (Z) 30 Group group 12
Zinc
Chemical element with atomic number 78 (Pt)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Pd ↑ Pt ↓ Ds iridium ← platinum → gold Atomic number (Z) 78 Group group 10
Platinum
Isotope of calcium
the discoveries of the five heaviest known elements, from flerovium to oganesson (atomic numbers 114 through 118). Heavier nuclei generally require a greater
Calcium-48
Chemical element with atomic number 42 (Mo)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Cr ↑ Mo ↓ W niobium ← molybdenum → technetium Atomic number (Z) 42 Group
Molybdenum
Chemical element with atomic number 7 (N)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ N ↓ P carbon ← nitrogen → oxygen Atomic number (Z) 7 Group group 15
Nitrogen
Music genre
Since I Left You". The Quietus. November 23, 2020. Retrieved May 4, 2023. Oganesson (September 28, 2021). "Plunderphonics Part 1: The Art of Musical Collage"
Plunderphonics
Chemical element with atomic number 8 (O)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ O ↓ S nitrogen ← oxygen → fluorine Atomic number (Z) 8 Group group 16
Oxygen
Chemical element with atomic number 38 (Sr)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Ca ↑ Sr ↓ Ba rubidium ← strontium → yttrium Atomic number (Z) 38 Group
Strontium
Plutonium and uranium present in nuclear fuel
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Minor actinides in the periodic table Hydrogen Helium Lithium Beryllium
Major_actinide
Chemical element with atomic number 95 (Am)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Eu ↑ Am ↓ — plutonium ← americium → curium Atomic number (Z) 95 Group
Americium
Chemical element with atomic number 11 (Na)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Li ↑ Na ↓ K neon ← sodium → magnesium Atomic number (Z) 11 Group group 1:
Sodium
Chemical element with atomic number 25 (Mn)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Mn ↓ Tc chromium ← manganese → iron Atomic number (Z) 25 Group group 7
Manganese
Chemical element with atomic number 24 (Cr)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Cr ↓ Mo vanadium ← chromium → manganese Atomic number (Z) 24 Group
Chromium
Chemical element with atomic number 22 (Ti)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Ti ↓ Zr scandium ← titanium → vanadium Atomic number (Z) 22 Group
Titanium
Topics referred to by the same term
British basketball player Ogom Chijindu, Nigerian sportswoman known as "OG" Oganesson, symbol Og, a chemical element Obstetrics and gynaecology Orange G, a
OG
Column of elements in the periodic table of the chemical elements
Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Group_(periodic_table)
Theoretical chemical element with atomic number 120 (Ubn)
interpreting data have been made. Elements 114 to 118 (flerovium through oganesson) were discovered in "hot fusion" reactions bombarding the actinides plutonium
Unbinilium
Chemical element with atomic number 51 (Sb)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson As ↑ Sb ↓ Bi tin ← antimony → tellurium Atomic number (Z) 51 Group group 15
Antimony
Chemical element with atomic number 112 (Cn)
forces, like the noble gases. Like mercury, radon, and flerovium, but not oganesson (eka-radon), copernicium is calculated to have no electron affinity. Interest
Copernicium
Chemical element with atomic number 87 (Fr)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Cs ↑ Fr ↓ (Uue) radon ← francium → radium Atomic number (Z) 87 Group group 1:
Francium
Category of metallic elements
to the immense polarisability of oganesson, it is expected that not only oganesson(II) fluoride but also oganesson(IV) fluoride should be predominantly
Post-transition_metal
Chemical element with atomic number 4 (Be)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Be ↓ Mg lithium ← beryllium → boron Atomic number (Z) 4 Group group 2
Beryllium
Chemical element with atomic number 57 (La)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ La ↓ Ac barium ← lanthanum → cerium Atomic number (Z) 57 Group f-block
Lanthanum
Chemical element with atomic number 54 (Xe)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Kr ↑ Xe ↓ Rn iodine ← xenon → caesium Atomic number (Z) 54 Group group 18
Xenon
Chemical element with atomic number 6 (C)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ C ↓ Si boron ← carbon → nitrogen Atomic number (Z) 6 Group group 14
Carbon
Chemical element with atomic number 77 (Ir)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Rh ↑ Ir ↓ Mt osmium ← iridium → platinum Atomic number (Z) 77 Group group 9
Iridium
Series of chemical elements
Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Transition_metal
Chemical element with atomic number 20 (Ca)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Mg ↑ Ca ↓ Sr potassium ← calcium → scandium Atomic number (Z) 20 Group
Calcium
Chemical element with atomic number 49 (In)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Ga ↑ In ↓ Tl cadmium ← indium → tin Atomic number (Z) 49 Group group 13
Indium
Chemical element with atomic number 91 (Pa)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Pr ↑ Pa ↓ — thorium ← protactinium → uranium Atomic number (Z) 91 Group
Protactinium
Physics research institute in Russia
114 (flerovium) 2000 – element 116 (livermorium) 2002 – element 118 (oganesson) 2003 – element 115 (moscovium) and element 113 (nihonium) 2010 – synthesis
Joint Institute for Nuclear Research
Joint_Institute_for_Nuclear_Research
Smallest unit of a chemical element
from the single-proton element hydrogen up to the 118-proton element oganesson. All known isotopes of elements with atomic numbers greater than 82 are
Atom
Chemical element with atomic number 113 (Nh)
Is Naming The Four New Elements Nihonium, Moscovium, Tennessine, And Oganesson". IUPAC. 8 June 2016. Retrieved 8 June 2016. Ikeda, Nagao (25 July 2011)
Nihonium
Term used for certain metallic elements
is naming the four new elements nihonium, moscovium, tennessine, and oganesson" accessed 27 August 2016. Iyengar G. V. 1998, "Reevaluation of the trace
Heavy_metals
Chemical element with atomic number 40 (Zr)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Ti ↑ Zr ↓ Hf yttrium ← zirconium → niobium Atomic number (Z) 40 Group
Zirconium
OGANESSON
OGANESSON
OGANESSON
OGANESSON
Surname or Lastname
English
English : habitational name for someone from either of two places called Mildenhall, in Suffolk and Wiltshire. The place in Suffolk may have been named in Old English as ‘middle nook of land’, from middel + halh, or it may be of the same origin as the Wiltshire place name, ‘Milda’s nook of land’, from an unattested Old English personal name + halh. The spelling Mendenhall does not appear in English sources, and this may be a U.S. variant.
Girl/Female
Afghan, Arabic, Australian, Bengali, Farsi, Indian, Iranian, Malaysian, Muslim
Queen; Daughter; Pleiades
Female
Egyptian
, the lady of heaven.
Boy/Male
Gujarati, Hindu, Indian, Kannada
The Best
Girl/Female
Tamil
Anulata | அநà¯à®²à®¾à®¤à®¾
One with very slim figure
Girl/Female
Indian
Goddess Name
Female
Chamoru
, serenade.
Girl/Female
Australian, French, German, Latin, Swedish
Little Female Bear
Girl/Female
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Tamil, Telugu
Graceful; Goddess Laxmi
Boy/Male
Indian, Punjabi, Sikh
Equal to One Thousand
OGANESSON
OGANESSON
OGANESSON
OGANESSON
OGANESSON