氬（原子量：39948 1）共有 25 個同位素，其中有 3 個是穩定的。 圖表 30Ar styletextalignright 18 styletextalignright 12 3002156 32 20 ns 29Cl 0 rowspan431Ar rowspan4 styletextalignright 18 rowspan4 styletextalignright 13 rowspan43101212 22 rowspan4144 6 ms β p 550 30S rowspan452 rowspan4 rowspan4 β 404 31Cl β 2p 248 29P β 3p 21 28Si rowspan232Ar rowspan2 styletextalignright 18 rowspan2 styletextalignright 14 rowspan2319976380 19 rowspan298 2 ms β 5699 32Cl rowspan20 rowspan2 rowspan2 β p 4301 31S rowspan233Ar rowspan2 styletextalignright 18 rowspan2 styletextalignright 15 rowspan2329899257 5 rowspan21730 20 ms β 6135 33Cl rowspan212 rowspan2 rowspan2 β p 3865 32S 34Ar styletextalignright 18 styletextalignright 16 339802712 4 8445 34 ms β 34Cl 0 35Ar styletextalignright 18 styletextalignright 17 349752576 8 1775 4 s β 35Cl 32 36Ar styletextalignright 18 styletextalignright 18 35967545106 29 colspan3 aligncenter 觀測上穩定 Believed to undergo double electron capture to 36S lightest theoretically unstable nuclide for which no evidence of radioactivity has been observed 0 0003336 4 37Ar styletextalignright 18 styletextalignright 19 3696677632 22 3504 4 d ε 37Cl 32 38Ar styletextalignright 18 styletextalignright 20 379627324 4 colspan3 aligncenter 0 629 1104 39ArUsed in styletextalignright 18 styletextalignright 21 38964313 5 269 3 y β 39K 72 痕量 用於和鉀－氬年代測定法中 styletextalignright 18 styletextalignright 22 399623831225 29 colspan3 aligncenter 穩定 0 0996035 4 Generated from 40K in rocks These ratios are terrestrial Cosmic abundance is far less than 36Ar 41Ar styletextalignright 18 styletextalignright 23 409645006 4 10961 4 min β 41K 72 痕量 42Ar styletextalignright 18 styletextalignright 24 41963046 6 329 11 y β 42K 0 43Ar styletextalignright 18 styletextalignright 25 42965636 6 537 6 min β 43K 52 44Ar styletextalignright 18 styletextalignright 26 439649240 17 1187 5 min β 44K 0 45Ar styletextalignright 18 styletextalignright 27 449680400 6 2148 15 s β 45K 123252 46Ar styletextalignright 18 styletextalignright 28 4596809 4 84 6 s β 46K 0 rowspan247Ar rowspan2 styletextalignright 18 rowspan2 styletextalignright 29 rowspan24697219 11 rowspan2123 3 s β 99 47K rowspan232 rowspan2 rowspan2 β n 1 46K 48Ar styletextalignright 18 styletextalignright 30 4797454 32 048 40 s β 48K 0 49Ar styletextalignright 18 styletextalignright 31 4898052 54 170 50 ms β 49K 32 50Ar styletextalignright 18 styletextalignright 32 4998443 75 85 30 ms β 50K 0 51Ar styletextalignright 18 styletextalignright 33 5099163 75 60 ms 200 ns β 51K 32 52Ar styletextalignright 18 styletextalignright 34 5199678 97 10 ms β 52K 0 rowspan253Ar rowspan2 styletextalignright 18 rowspan2 styletextalignright 35 rowspan25300494 107 rowspan23 ms β 53K rowspan252 rowspan2 rowspan2 β n 52K 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 Ar Category 氬