Nitrogen

01 / A closer look

Meet Nitrogen

Nitrogen has atomic number 7: every atom of this element contains 7 protons. It belongs to period 2, group 15 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

63.2 K

Boiling point

77.355 K

Density

0.001145 g/cm³

Atomic weight

14.007 ± 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 2p3

Oxidation states

+5, +4, +3, +2, +1, -1, -2, -3

Electronegativity · Pauling

3.04

First ionisation energy

14.534 eV

Atomic radius

155 pm

04 / Where it is found

Where it is found

About 78% of dry air by volume.

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