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'There are thirteen recognized [[isotope]]s of [[sodium]]. ²³Na is the only stable isotope. As such, it is considered a monoisotopic element and it has a standard atomic mass: 22.98976928(2) [[unified atomic mass unit|u]]. Sodium has two [[radioactive]] [[cosmogenic]] isotopes (²²Na, [[half-life]] = 2.605 years; and ²⁴Na, half-life ≈ 15 hours). hahhahahhahhahahaha!!!!!!!!!!!!!!!!hehehe Acute neutron radiation exposure (e.g., from a nuclear [[criticality accident]]) converts some of the stable ²³Na in human blood plasma to ²⁴Na. By measuring the concentration of this isotope, the neutron radiation dosage to the victim can be computed. ²²Na is a [[positron]]-emitting [[isotope]] with a remarkably long [[half-life]]. It is used to create test-objects and point-sources for [[Positron emission tomography]]. == Table == {| class="wikitable" style="font-size:95%; white-space:nowrap" ! rowspan="2" | nuclide<br />symbol ! Z([[proton|p]]) ! N([[neutron|n]]) ! &nbsp;<br />isotopic mass (u)<br />&nbsp; ! rowspan="2" | half-life ! rowspan="2" | nuclear<br />spin ! rowspan="2" | representative<br />isotopic<br />composition<br />(mole fraction) ! rowspan="2" | range of natural<br />variation<br />(mole fraction) |- ! colspan="3" | excitation energy |- | ¹⁸Na | style="text-align:right" | 11 | style="text-align:right" | 7 | 18.02597(5) | 1.3(4)E-21 s | (1-)# | | |- | ¹⁹Na | style="text-align:right" | 11 | style="text-align:right" | 8 | 19.013877(13) | <40 ns | (5/2+)# | | |- | ²⁰Na | style="text-align:right" | 11 | style="text-align:right" | 9 | 20.007351(7) | 447.9(23) ms | 2+ | | |- | ²¹Na | style="text-align:right" | 11 | style="text-align:right" | 10 | 20.9976552(8) | 22.49(4) s | 3/2+ | | |- | [[Sodium-22|²²Na]] | style="text-align:right" | 11 | style="text-align:right" | 11 | 21.9944364(4) | 2.6027(10) yr | 3+ | | |- | style="text-indent:1em" | ^22mNa | colspan="3" style="text-indent:2em" | 583.03(9) keV | 244(6) ns | 1+ | | |- | [[Sodium-23|²³Na]] | style="text-align:right" | 11 | style="text-align:right" | 12 | 22.9897692809(29) | STABLE | 3/2+ | 1.0000 | |- | ²⁴Na | style="text-align:right" | 11 | style="text-align:right" | 13 | 23.99096278(8) | 14.9590(12) h | 4+ | | |- | style="text-indent:1em" | ^24mNa | colspan="3" style="text-indent:2em" | 472.207(9) keV | 20.20(7) ms | 1+ | | |- | ²⁵Na | style="text-align:right" | 11 | style="text-align:right" | 14 | 24.9899540(13) | 59.1(6) s | 5/2+ | | |- | ²⁶Na | style="text-align:right" | 11 | style="text-align:right" | 15 | 25.992633(6) | 1.077(5) s | 3+ | | |- | ²⁷Na | style="text-align:right" | 11 | style="text-align:right" | 16 | 26.994077(4) | 301(6) ms | 5/2+ | | |- | ²⁸Na | style="text-align:right" | 11 | style="text-align:right" | 17 | 27.998938(14) | 30.5(4) ms | 1+ | | |- | ²⁹Na | style="text-align:right" | 11 | style="text-align:right" | 18 | 29.002861(14) | 44.9(12) ms | 3/2(+#) | | |- | ³⁰Na | style="text-align:right" | 11 | style="text-align:right" | 19 | 30.008976(27) | 48.4(17) ms | 2+ | | |- | ³¹Na | style="text-align:right" | 11 | style="text-align:right" | 20 | 31.01359(23) | 17.0(4) ms | (3/2+) | | |- | ³²Na | style="text-align:right" | 11 | style="text-align:right" | 21 | 32.02047(38) | 12.9(7) ms | (3-,4-) | | |- | ³³Na | style="text-align:right" | 11 | style="text-align:right" | 22 | 33.02672(94) | 8.2(2) ms | 3/2+# | | |- | ³⁴Na | style="text-align:right" | 11 | style="text-align:right" | 23 | 34.03517(96)# | 5.5(10) ms | 1+ | | |- | ³⁵Na | style="text-align:right" | 11 | style="text-align:right" | 24 | 35.04249(102)# | 1.5(5) ms | 3/2+# | | |- | ³⁶Na | style="text-align:right" | 11 | style="text-align:right" | 25 | 36.05148(102)# | <260 ns | | | |- | ³⁷Na | style="text-align:right" | 11 | style="text-align:right" | 26 | 37.05934(103)# | 1# ms [>1.5 µs] | 3/2+# | | |} === Notes === * Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses. * Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties. == References == * Isotope masses from [http://www.nndc.bnl.gov/amdc/index.html Ame2003 Atomic Mass Evaluation] by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in ''Nuclear Physics'' A729 (2003). * Isotopic compositions and standard atomic masses from [http://www.iupac.org/publications/pac/2003/7506/7506x0683.html Atomic weights of the elements. Review 2000 (IUPAC Technical Report)]. ''Pure Appl. Chem.'' Vol. 75, No. 6, pp. 683–800, (2003) and [http://www.iupac.org/news/archives/2005/atomic-weights_revised05.html Atomic Weights Revised (2005)]. * Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page. ** Audi, Bersillon, Blachot, Wapstra. [http://amdc.in2p3.fr/web/nubase_en.html The Nubase2003 evaluation of nuclear and decay properties], Nuc. Phys. A 729, pp. 3–128 (2003). ** National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the [http://www.nndc.bnl.gov/nudat2/ NuDat 2.1 database] (retrieved Sept. 2005). ** David R. Lide (ed.), Norman E. Holden in ''CRC Handbook of Chemistry and Physics, 85th Edition'', online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes. ==External links== *[http://ie.lbl.gov/education/parent/Na_iso.htm Sodium isotopes data from ''The Berkeley Laboratory Isotopes Project's''] {{Isotope nav | element=sodium | lighter=Isotopes of neon | heavier=Isotopes of magnesium }} [[Category:Sodium]] [[Category:Isotopes of sodium|*]] [[Category:Lists of isotopes by element|Sodium]] [[ca:Isòtops del sodi]] [[eo:Izotopoj de natrio]] [[he:נתרן#איזוטופים של נתרן]] [[hu:A nátrium izotópjai]] [[ja:ナトリウムの同位体]] [[zh:鈉的同位素]]'