Symbol	N
Atomnummer	7
Gruppe	15 (Kvælstof-fosfor-gruppe)
Periode	2
Blok	p
Klassifikation	Ikkemetal

Udseende	Colorless gas, liquid or solid
Farve	Farveløs

Antal protoner	7 p+
Antal neutroner	7 n0
Antal elektroner	7 e-

Fra Wikipedia, den gratis encyklopædiNitrogen eller kvælstof er det 7. grundstof i det periodiske system og har det kemiske symbol N. Under normale temperatur- og trykforhold optræder nitrogen i form af molekylet dinitrogen, N₂, som er en farveløs, smagløs, lugtfri og relativt ikke-reaktiv gas, der efter rumfang udgør 78,1 % af Jordens atmosfære.

Fase ved STP	Gas
Massefylde	1.251 g/cm3
Atommasse	14.0064 u

Smeltepunkt	63.15 K -210 °C -346 °F
Kogepunkt	77.355 K -195.795 °C -320.431 °F
Fordampningsvarme	2.7928 kJ/mol

Elektronegativitet (Pauling Scale)	3.04
Elektronaffinitet	-6.8 kJ/mol
Oxidationstrin	−3, −2, −1, +1, +2, +3, +4, +5 (a strongly acidic oxide)
Ioniseringsenergier	1402.3 kJ/mol 2856 kJ/mol 4578.1 kJ/mol 7475 kJ/mol 9444.9 kJ/mol 53266.6 kJ/mol 64360 kJ/mol

Elektronkonfiguration Kortfattet konfiguration	[He] 2s2 2p3
Elektronkonfiguration Fuld konfiguration	1s2 2s2 2p3
Elektronkonfigurationsdiagram	1s2 2s2 2p3
Elektroner pr. Skal	2, 5
Valenselektroner	5
Valency-elektroner	3
Bohrs atommodel	Figur: Skaldiagram af Kvælstof (N) atom.
Orbital diagram	1s 2s 2p

Opdagelse og første isolation	Daniel Rutherford (1772)
Navngivet af	Jean-Antoine Chaptal (1790)
Opdagelse af kvælstof Nitrogen was first discovered and isolated by Scottish physician Daniel Rutherford in 1772, he discovered nitrogen while studying at the University of Edinburgh. He showed that the air in which animals had breathed, even after removal of the exhaled carbon dioxide, was no longer able to burn a candle. Although Carl Wilhelm Scheele and Henry Cavendish had independently done so at about the same time, Rutherford is generally accorded the credit because his work was published first. The name nitrogène was suggested by French chemist Jean-Antoine-Claude Chaptal in 1790 when it was found that nitrogen was present in nitric acid and nitrates.

CAS Number	7727-37-9
ChemSpider ID	20473555
EC number	231-783-9
PubChem CID Number	947