氖（原子量：201797 6）共有 19 個已知同位素，質量數介於 1534 之間，其中有 3 個是穩定的，其他都具有放射性。天然存在的氖同位素有 3 個，分別是 20Ne、21Ne、22Ne，皆為穩定同位素。其他放射性同位素都不出現在自然界中，只有在實驗室製造出來過，且半衰期都極短，非常不穩定。 圖表 15Ne styletextalignright 10 styletextalignright 5 1504317 7 77 31022 s 059 232522 60 MeV 2p 13O 32 16Ne styletextalignright 10 styletextalignright 6 16025761 22 91021 s 122 37 keV 2p 14O 0 rowspan317NeHas 2 protons rowspan3 styletextalignright 10 rowspan3 styletextalignright 7 rowspan317017672 29 rowspan31092 6 ms β p 960 16O rowspan312 rowspan3 rowspan3 β α 27 13N β 13 17F rowspan3 18Ne rowspan3 styletextalignright 10 rowspan3 styletextalignright 8 rowspan3180057082 3 rowspan31672 8 s β 18F rowspan30 rowspan3 rowspan3 2p 16O 2He 氦 2 發射 16O 2He 19Ne styletextalignright 10 styletextalignright 9 190018802 3 17296 5 s β 19F 12 styletextalignright 10 styletextalignright 10 199924401754 19 colspan3 aligncenter 0 09048 3 0884709051 21Ne styletextalignright 10 styletextalignright 11 2099384668 4 colspan3 aligncenter 穩定 32 00027 1 0002700171 22Ne styletextalignright 10 styletextalignright 12 21991385114 19 colspan3 aligncenter 穩定 0 00925 3 0092000996 23Ne styletextalignright 10 styletextalignright 13 2299446690 11 3724 12 s β 23Na 52 24Ne styletextalignright 10 styletextalignright 14 239936108 4 338 2 min β 24Na 0 25Ne styletextalignright 10 styletextalignright 15 24997737 28 602 8 ms β 25Na 32 rowspan226Ne rowspan2 styletextalignright 10 rowspan2 styletextalignright 16 rowspan226000461 29 rowspan2197 1 ms β 9987 26Na rowspan20 rowspan2 rowspan2 β n 13 25Na rowspan227Ne rowspan2 styletextalignright 10 rowspan2 styletextalignright 17 rowspan22700759 12 rowspan232 2 ms β 980 27Na rowspan232 rowspan2 rowspan2 β n 20 26Na rowspan228Ne rowspan2 styletextalignright 10 rowspan2 styletextalignright 18 rowspan22801207 16 rowspan2183 22 ms β 780 28Na rowspan20 rowspan2 rowspan2 β n 220 27Na 29Ne styletextalignright 10 styletextalignright 19 2901939 29 156 5 ms β 29Na 32 30Ne styletextalignright 10 styletextalignright 20 3002480 61 58 2 ms β 30Na 0 rowspan231Ne rowspan2 styletextalignright 10 rowspan2 styletextalignright 21 rowspan23103311 97 rowspan234 8 ms β 31Na rowspan272 rowspan2 rowspan2 β n 30Na rowspan232Ne rowspan2 styletextalignright 10 rowspan2 styletextalignright 22 rowspan23204002 86 rowspan235 9 ms β n 31Na rowspan20 rowspan2 rowspan2 β 32Na 33Ne styletextalignright 10 styletextalignright 23 3304938 86 260 ns 72 34Ne styletextalignright 10 styletextalignright 24 3405703 87 1 ms 15 µs 0 參考文獻 Isotope masses from Ame2003 Atomic Mass Evaluation by G Audi AH Wapstra C Thibault J Blachot and O Bersillon in Nuclear Physics A729 2003 Isotopic compositions and standard atomic masses from Atomic weights of the elements Review 2000 IUPAC Technical Report Pure Appl Chem Vol 75 No 6 pp 683800 2003 and Atomic Weights Revised 2005 Halflife spin and isomer data selected from these sources Editing notes on this articles talk page Audi Bersillon Blachot Wapstra The Nubase2003 evaluation of nuclear and decay properties Nuc Phys A 729 pp 3128 2003 National Nuclear Data Center Brookhaven National Laboratory Information extracted from the NuDat 21 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 Ne Category 氖