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118 Og Oganesson 294

Oganesson

UNKNOWN, PREDICTED TO BE NOBLE GAS
Bohr Model: Electrons arranged in energy shells around the nucleus.

Oganesson is IUPAC's name for the transactinide element with the atomic number 118 and element symbol Og. It is also known as eka-radon or element 118, and on the periodic table of the elements it is a p-block element and the last one of the 7th period. Oganesson is currently the only synthetic member of group 18.

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Quick Facts

Atomic Number 118
Period 7
Group 18
Phase Solid
Appearance Unknown
About Unknown, Predicted To Be Noble Gass

Noble gases are colorless, odorless, and extremely unreactive (inert) due to having full valence electron shells.

History

Discovered By Joint Institute for Nuclear Research
Named By Unknown

Physical Properties

Atomic Mass 294
Density 4.95 g/L
Molar Heat N/A J/(mol·K)
Phase Transition (Melting & Boiling Points)

Oganesson boils at 350 K. The melting point is currently unknown.

Atomic Properties

Electron Config *[Rn] 5f14 6d10 7s2 7p6
Electronegativity N/A
Electron Affinity 5.40318 kJ/mol
Ionization Energy N/A kJ/mol
Orbital Filling Diagram
This diagram visualizes electron configuration according to the Aufbau principle and Hund's rule. Boxes represent orbitals (s, p, d, f), while arrows indicate electrons with spin up or down. Electrons fill lower energy levels first and occupy orbitals singly before pairing.

Photograph

Image of Oganesson Source: Wikipedia

External Resources

Wikipedia PubChem Royal Society of Chemistry Periodic Videos (YouTube)

Study Guide

Atomic Number

The number of protons in the nucleus, which defines the element.

Atomic Mass

The average mass of an atom, including protons and neutrons.

Electronegativity

A measure of how strongly an atom attracts electrons in a bond.

Ionization Energy

The energy required to remove an electron from an atom.

Electron Config

The arrangement of electrons in the atom's energy shells.