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118 · Og

Oganesson

The 2002 announcement remains disputed. The synthesis upheld is that of 2006. The name oganesson in 2016.

Identity

Atomic number
118
Symbol
Og
Canonical name
Oganesson
Category
classification unsettled
Group
18
Period
7
Block
p

Bulk chemistry is not established. The table column is not a confirmed family.

Properties

These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.

Atomic mass
[294] No standard atomic weight. The number shown is the conventional mass number used in tables, not a measured mass in u.
Electron configuration
*[Rn] 5f14 6d10 7s2 7p6
Electrons per shell
2, 8, 18, 32, 32, 18, 8
Standard state
not established
Density
4.95 g/cm³ (estimated) Predicted value: the element has not been observed in bulk.
Boiling point
350 K (estimated) Predicted value: the element has not been observed in bulk.

Notable isotopes

This summary is not an inventory of every isotope.

Conventional mass number: 294

History

The 2002 announcement

Synthesis · disputed · 2002

A first announcement of element 118 in 2002 is not the synthesis later upheld. It remains disputed.

Oganesson

Synthesis · confirmed · 2006

Dubna and Livermore produce oganesson by bombarding californium with calcium-48.

Reaction
249Cf(48Ca,3n)294Og
Target
249Cf
Projectile
48Ca
Isotope produced
294Og

The name oganesson

Official recognition · officially recognized · 2016

IUPAC adopts the name oganesson in 2016.

See the element timeline

Etymology

Theme
scientist
Language
russe
Root
Oganessian
Meaning
Yuri Oganessian
Temporary systematic name
ununoctium (Uuo)
Official adoption
2016

Scientists

Places and institutions

  • Dubna — historical setting : Soviet Union — present country : Russia

See also

Sources