Structure via PubChem · Public domain (PubChem)
carbon-13
Sign in to saveAlso known as C-13, 13C, carbon-13 atom, (13)C, (13)6C, ¹³C
Carbon-13 (13C) is a natural, stable isotope of carbon with a nucleus containing six protons and seven neutrons. It constitutes about 1.07% of natural carbon and is one of the so-called environmental isotopes.
Key facts
- Isotope.symbol
- C
- Isotope.mass_number
- 13
- Isotope.mass
- 13.003354835
- Isotope.num_neutrons
- 7
- Isotope.num_protons
- 6
- Isotope.abundance
- 1.07%
- Isotope.image
- Carbon-13.svg
- Isotope.spin
- −
via Wikipedia infobox
Chemical data
- Formula
- C
- Molecular weight
- 13.003354835 g/mol
- IUPAC name
- carbane
- SMILES
- [13C]
- InChIKey
- OKTJSMMVPCPJKN-OUBTZVSYSA-N
- XLogP
- 0.6
- Polar surface area
- 0 Ų
- H-bond donors
- 0
- H-bond acceptors
- 0
- Formal charge
- 0
via PubChem
Wikidata facts
- Instance of
- stable isotope
- Subclass of
- carbon
- Mass
- 13.0033548352
- Image
- Carbon-13.svg
Show 9 more facts
- atomic number
- 6
- neutron number
- 7
- natural abundance
- 0.0107
- spin quantum number
- 0.5
- parity quantum number
- -1
- isomeric SMILES
- [13C]
- canonical SMILES
- [C]
- mass excess
- 3125.00888
- binding energy
- 97108.037
Sources (8)
via Wikidata · CC0
~5 min read
Encyclopedic overview
5 sectionsContents
- Detection by mass spectrometry
- Uses in science
- Production
- See also
- Notes
Carbon-13 (13C) is a natural, stable isotope of carbon with a nucleus containing six protons and seven neutrons. It constitutes about 1.07% of natural carbon and is one of the so-called environmental isotopes.
== Detection by mass spectrometry == A mass spectrum of an organic compound will usually contain a small peak of one mass unit greater than the apparent molecular ion peak (M) of the whole molecule. This is known as the M+1 peak and comes from the few molecules that contain a 13C atom in place of a 12C. A molecule containing one carbon atom will be expected to have an M+1 peak of approximately 1.1% of the size of the M peak, as 1.1% of the molecules will have a 13C rather than a 12C. Similarly, a molecule containing two carbon atoms will be expected to have an M+1 peak of approximately 2.2% of the size of the M peak, as there is double the previous likelihood that any molecule will contain a 13C atom.
Excerpted from Wikipedia’s “carbon-13” article, available under the CC BY-SA 4.0 licence.