Neon

Atomic number

10

Atomic mass (u)

20.180

Category

Noble gas

Standard state

Gas

Melting point

-248.59 °C (24.56 K)

Boiling point

-246.08 °C (27.07 K)

Density (g/cm³)

0.0008999

Electronegativity (Pauling)

Not reported in this source

Electron configuration

[He]2s2 2p6

Oxidation states

0

Atomic radius (pm)

154

First ionization energy (eV)

21.565

Discovery & recognition

Discovery year / period (PubChem)

1898

Discovery credited to (RSC)

Sir William Ramsay and Morris Travers

Date or period recorded by RSC

1898

Discovery place

Not supplied in the structured record; see the RSC history source.

An ancient date does not identify a first human discovery. Different references may date observation, isolation and formal recognition differently.

Natural occurrence & production

The creation of an element’s nuclei and its concentration into terrestrial deposits are different processes. The occurrence note below concerns its presence or production on Earth; it is not a complete account of nucleosynthesis.

“Neon is the fifth most abundant element in the universe.”

Royal Society of Chemistry · occurrence excerpt ↗

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Reference values are not product specifications. Blank values have not been estimated. For superheavy elements, some properties and family assignments are theoretical or incompletely measured.