Element Nitrogen

Nitrogen ElementIt is the chemical element with the symbol N and atomic number 7.
Element Nitrogen was first discovered and isolated by Scottish physician Daniel Rutherford in 1772.
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.
Antoine Lavoisier suggested instead the name azote, from the Greek ἀζωτικός “no life”, as it is an asphyxiant gas; this name is instead used in many languages, such as French, Russian, Romanian and Turkish, and appears in the English names of some nitrogen compounds such as hydrazine, azides and azo compounds.

Names and Identifiers

Chemical Formula:N
Molecular Weight:28.01340g/mol
EC Number :231-783-9
MDL Number:MFCD00011416
Other Names:Azote, Stickstoff, Azoto, Nitrogênio
PubChem CID:947
IUPAC Name:Nitrogen
Canonical SMILES:[N]
ICSC Number:1198

Physical & Chemical Properties

Density:1.2506 g/L
Boiling Point:77.355 K ​(−195.795 °C, ​−320.431 °F)
Melting Point:63.15 K ​(−210.00 °C, ​−346.00 °F)
Molecular Formula:N
Flash Point:n/a
Exact Mass:28.00610
Symbol:Globally Harmonized System of Classification
Signal Word:Warning
Hazard Statements:H280
Precautionary Statements:n/a
Hazard Codes:n/a
Risk Phrases:n/a
Safety Phrases:S38
RIDADR:UN 1066 2.2
WGK Germany:3
Packaging Group:III
Hazard Class:2.2

Nitrogen has two isotopes, N-14 and N-15, both of which are used in various applications. N-15 is used for the production of the radioisotope O-15 which is used in PET. N-15 is also used to study the uptake of Nitrogen in plants and the metabolism of proteins in the human body. N-14 is used for the production of the PET radioisotope C-11. It can also be used for the production of the PET radioisotopes N-13 and O-15.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
14N14.003 074 005 2(9)99.632 (7)10.4037607
15N15.000 108 898 4(9)0.368 (7)1/2-0.2831892

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
12N12.0186130.011 sEC to 12C; EC + 3α to n10.457
13N13.00573869.97 mEC to 13C1/20.3222
16N16.0061007.13 sβ to 16O2
17N17.008454.17 sβ to 17O, β + n to 16O1/2
18N18.014080.62 sβ to 18O; β + α to 14C1
19N19.017040.3 sβ to 19O
20N20.02370.1 sβ to 20O

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