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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
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
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
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
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
Predicted set of isotopes of relatively more stable superheavy elements
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
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 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)
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
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
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
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)
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
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)
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
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 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
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
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
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 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 85 (At)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson I ↑ At ↓ Ts polonium ← astatine → radon Atomic number (Z) 85 Group group 17
Astatine
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 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 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 26 (Fe)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Fe ↓ Ru manganese ← iron → cobalt Atomic number (Z) 26 Group group 8
Iron
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)
Group of chemical elements
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson alkali metals ← → group 3 IUPAC group number 2 Name by element beryllium
Alkaline_earth_metal
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
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 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
Set of adjacent groups
the helium group, composed of the noble gases (excluding helium) and oganesson. Alternatively, the p-block can be described as containing post-transition
Block_(periodic_table)
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
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
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
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 18 (Ar)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Ne ↑ Ar ↓ Kr chlorine ← argon → potassium Atomic number (Z) 18 Group group 18
Argon
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)
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
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 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 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 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 74 (W)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Mo ↑ W ↓ Sg tantalum ← tungsten → rhenium Atomic number (Z) 74 Group group 6
Tungsten
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
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 92 (U)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Nd ↑ U ↓ — protactinium ← uranium → neptunium Atomic number (Z) 92 Group
Uranium
American chemist (1912–1999)
officially named after a living person. The second element to be so named is oganesson, in 2016, after Yuri Oganessian. Seaborg, G.T.; James, R.A.; Morgan, L
Glenn_T._Seaborg
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
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
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
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 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 101 (Md)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Tm ↑ Md ↓ — fermium ← mendelevium → nobelium Atomic number (Z) 101 Group
Mendelevium
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
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
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
Chemical element with atomic number 39 (Y)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Sc ↑ Y ↓ Lu strontium ← yttrium → zirconium Atomic number (Z) 39 Group
Yttrium
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 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 103 (Lr)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Lu ↑ Lr ↓ — nobelium ← lawrencium → rutherfordium Atomic number (Z) 103
Lawrencium
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
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
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 33 (As)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson P ↑ As ↓ Sb germanium ← arsenic → selenium Atomic number (Z) 33 Group
Arsenic
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 78 (Pt)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Pd ↑ Pt ↓ Ds iridium ← platinum → gold Atomic number (Z) 78 Group group 10
Platinum
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
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
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 99 (Es)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Ho ↑ Es ↓ — californium ← einsteinium → fermium Atomic number (Z) 99 Group
Einsteinium
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)
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 22 (Ti)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Ti ↓ Zr scandium ← titanium → vanadium Atomic number (Z) 22 Group
Titanium
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 14 (Si)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson C ↑ Si ↓ Ge aluminium ← silicon → phosphorus Atomic number (Z) 14 Group
Silicon
Chemical element with atomic number 27 (Co)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Co ↓ Rh iron ← cobalt → nickel Atomic number (Z) 27 Group group 9
Cobalt
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
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 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 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 89 (Ac)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson La ↑ Ac ↓ — radium ← actinium → thorium Atomic number (Z) 89 Group f-block
Actinium
Chemical element with atomic number 116 (Lv)
the periodic table: flerovium, moscovium, livermorium, tennessine, and oganesson. In 1995, an international team led by Sigurd Hofmann at the Gesellschaft
Livermorium
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 element with atomic number 108 (Hs)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Os ↑ Hs ↓ — bohrium ← hassium → meitnerium Atomic number (Z) 108 Group
Hassium
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 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 88 (Ra)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Ba ↑ Ra ↓ (Ubn) francium ← radium → actinium Atomic number (Z) 88 Group
Radium
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 110 (Ds)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Pt ↑ Ds ↓ — meitnerium ← darmstadtium → roentgenium Atomic number (Z)
Darmstadtium
Chemical element with atomic number 60 (Nd)
Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Nd ↓ U praseodymium ← neodymium → promethium Atomic number (Z) 60
Neodymium
OGANESSON
OGANESSON
OGANESSON
OGANESSON
Boy/Male
Muslim
Leader
Girl/Female
American, Australian, Latin
A Form of Rosana; Gracious
Surname or Lastname
English (Devon)
English (Devon) : habitational name from a lost or unidentified place, probably in southwestern England, where the surname is most common.
Male
English
Variant spelling of English Zebina, ZEBINAH means "bought." In the bible, this is the name of a son of Nebo who took a foreign wife.
Boy/Male
Hindu
Girl/Female
Arabic, Muslim
Honour; Place; Status; Show
Surname or Lastname
English (Shropshire, Worcestershire)
English (Shropshire, Worcestershire) : variant of Welsh Owen.
Surname or Lastname
English
English : habitational name from any of various places, mostly in southwestern England, named in Old English as ‘small settlement’, from l̄tel ‘small’ + tūn ‘enclosure’, ‘settlement’.
Boy/Male
Egyptian
Provider.
Female
Native American
Native American Mohawk form of Greek Aikaterine, KATERI means "pure."
OGANESSON
OGANESSON
OGANESSON
OGANESSON
OGANESSON