Neon

01 / A closer look

Meet Neon

Neon has atomic number 10: every atom of this element contains 10 protons. It belongs to period 2, group 18 of the periodic table.

In a neutral atom, the number of electrons equals the number of protons. Isotopes of this element share the same atomic number but have different neutron counts.

02 / Physical properties

Melting point

24.56 K

Boiling point

27.104 K

Density

0.000825 g/cm³

Atomic weight

20.180 ± 0.001

Melting points, boiling points and densities follow RSC fact boxes. Density is referenced to room temperature; consult the source for pressure and allotrope details. These are reference values, not a claim that every value was experimentally measured. Atomic weights follow CIAAW.

Physical-property source: Royal Society of Chemistry ↗ · Reviewed 24 September 2026

Standard atomic weights follow CIAAW 2024 (abridged). Brackets show an isotope mass number from IUPAC 2022, not a standard atomic weight.

03 / Atomic structure

Atomic structure

Electron configuration

[He]2s2 2p6

Oxidation states

0

Electronegativity · Pauling

Not listed

First ionisation energy

21.565 eV

Atomic radius

154 pm

04 / Where it is found

Where it is found

A trace gas separated from liquefied air.

Production and export figures depend on the commodity and reporting year. No comparable country quantities have been included for this element in this edition.