Naturally occurring tungsten (74W) consists of five isotopes. Four are considered stable (182W, 183W, 184W, and 186W) and one is slightly radioactive, 180W, with an extremely long half-life of . This results in about two alpha decays of 180W per gram of natural tungsten per year, so for most practical purposes, 180W can be considered stable. The other naturally occurring isotopes are also capable of alpha decay and so only observationally stable.
Artificial radioisotopes of tungsten have been observed from 156W to 197W, the most stable of which are 181W with a half-life of 120.96 days, 185W with a half-life of 75.1 days, 188W with a half-life of 69.77 days and 178W with a half-life of 21.6 days. All of the remaining radioactive isotopes have half-lives less than one day, and most of these less than 8 minutes. The most stable known meta state is 179m1W with half-life 6.40 minutes. List of isotopes
|-id=Tungsten-156 | 156W | style="text-align:right" | 74 | style="text-align:right" | 82 | | style="text-align:center" | 2024 | | β+ | 156Ta | 0+
|-id=Tungsten-157 | 157W | style="text-align:right" | 74 | style="text-align:right" | 83 | 156.97886(43)# | style="text-align:center" | 2010 | 275(40) ms | β+ | 157Ta | (7/2−)
|-id=Tungsten-158 | 158W | style="text-align:right" | 74 | style="text-align:right" | 84 | 157.97457(32)# | style="text-align:center" | 1981 | 1.43(18) ms | α | 154Hf | 0+
|-id=Tungsten-158m | style="text-indent:1em" | 158mW | colspan="3" style="text-indent:2em" | 1889(8) keV | style="text-align:center" | 1989 | 143(19) μs | α | 154Hf | (8+)
|-id=Tungsten-159 | 159W | style="text-align:right" | 74 | style="text-align:right" | 85 | 158.97270(32)# | style="text-align:center" | 1981 | 8.2(7) ms | α (82%) | 155Hf | 7/2−#
|-id=Tungsten-160 | rowspan=2|160W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 86 | rowspan=2|159.96851(16) | rowspan=2 style="text-align:center" | 1979 | rowspan=2|90(5) ms | α (87%) | 156Hf | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β+ (13%) | 160Ta |-id=Tungsten-161 | rowspan=2|161W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 87 | rowspan=2|160.96725(22)# | rowspan=2 style="text-align:center" | 1973 | rowspan=2|409(16) ms | α (73%) | 157Hf | rowspan=2|7/2−# | rowspan=2| | rowspan=2| |- | β+ (27%) | 161Ta |-id=Tungsten-162 | rowspan=2|162W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 88 | rowspan=2|161.963500(19) | rowspan=2 style="text-align:center" | 1973 | rowspan=2|1.19(12) s | β+ (54.8%) | 162Ta | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (45.2%) | 158Hf |-id=Tungsten-163 | rowspan=2|163W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 89 | rowspan=2|162.962524(63) | rowspan=2 style="text-align:center" | 1973 | rowspan=2|2.63(9) s | β+ (86%) | 163Ta | rowspan=2|7/2− | rowspan=2| | rowspan=2| |- | α (14%) | 159Hf |-id=Tungsten-163m | style="text-indent:1em" | 163mW | colspan="3" style="text-indent:2em" | 480.3(7) keV | style="text-align:center" | 2010 | 154(3) ns | IT | 163W | 13/2+
|-id=Tungsten-164 | rowspan=2|164W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 90 | rowspan=2|163.958952(10) | rowspan=2 style="text-align:center" | 1973 | rowspan=2|6.3(2) s | β+ (96.2%) | 164Ta | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (3.8%) | 160Hf |-id=Tungsten-165 | 165W | style="text-align:right" | 74 | style="text-align:right" | 91 | 164.958281(28) | style="text-align:center" | 1975 | 5.1(5) s | β+ | 165Ta | (5/2−)
|-id=Tungsten-166 | rowspan=2|166W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 92 | rowspan=2|165.955032(10) | rowspan=2 style="text-align:center" | 1975 | rowspan=2|19.2(6) s | β+ (99.97%) | 166Ta | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (0.035%) | 162Hf |-id=Tungsten-167 | rowspan=2|167W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 93 | rowspan=2|166.954811(20) | rowspan=2 style="text-align:center" | 1985 | rowspan=2|19.9(5) s | β+ (99.96%) | 167Ta | rowspan=2|(5/2−) | rowspan=2| | rowspan=2| |- | α (0.04%) | 163Hf |-id=Tungsten-168 | rowspan=2|168W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 94 | rowspan=2|167.951805(14) | rowspan=2 style="text-align:center" | 1971 | rowspan=2|50.9(19) s | β+ (99.97%) | 168Ta | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (0.032%) | 164Hf |-id=Tungsten-169 | 169W | style="text-align:right" | 74 | style="text-align:right" | 95 | 168.951779(17) | style="text-align:center" | 1985 | 74(6) s | β+ | 169Ta | 5/2−#
|-id=Tungsten-170 | 170W | style="text-align:right" | 74 | style="text-align:right" | 96 | 169.949231(14) | style="text-align:center" | 1971 | 2.42(4) min | β+(99%) | 170Ta | 0+
|-id=Tungsten-171 | 171W | style="text-align:right" | 74 | style="text-align:right" | 97 | 170.949451(30) | style="text-align:center" | 1983 | 2.38(4) min | β+ | 171Ta | (5/2−)
|-id=Tungsten-172 | 172W | style="text-align:right" | 74 | style="text-align:right" | 98 | 171.947292(30) | style="text-align:center" | 1965 | 6.6(9) min | β+ | 172Ta | 0+
|-id=Tungsten-173 | 173W | style="text-align:right" | 74 | style="text-align:right" | 99 | 172.947689(30) | style="text-align:center" | 1963 | 7.6(2) min | β+ | 173Ta | 5/2−
|-id=Tungsten-174 | 174W | style="text-align:right" | 74 | style="text-align:right" | 100 | 173.946079(30) | style="text-align:center" | 1965 | 33.2(21) min | β+ | 174Ta | 0+
|-id=Tungsten-174m1 | style="text-indent:1em" | 174m1W | colspan="3" style="text-indent:2em" | 2267.8(4) keV | style="text-align:center" | 1978 | 158(3) ns | IT | 174W | 8−
|-id=Tungsten-174m2 | style="text-indent:1em" | 174m2W | colspan="3" style="text-indent:2em" | 3515.6(4) keV | style="text-align:center" | 2006 | 128(8) ns | IT | 174W | 12+
|-id=Tungsten-175 | 175W | style="text-align:right" | 74 | style="text-align:right" | 101 | 174.946717(30) | style="text-align:center" | 1963 | 35.2(6) min | β+ | 175Ta | (1/2−)
|-id=Tungsten-175m | style="text-indent:1em" | 175mW | colspan="3" style="text-indent:2em" | 234.96(15) keV | style="text-align:center" | 1978 | 216(6) ns | IT | 175W | (7/2+)
|-id=Tungsten-176 | 176W | style="text-align:right" | 74 | style="text-align:right" | 102 | 175.945634(30) | style="text-align:center" | 1950 | 2.5(1) h | EC | 176Ta | 0+
|-id=Tungsten-177 | 177W | style="text-align:right" | 74 | style="text-align:right" | 103 | 176.946643(30) | style="text-align:center" | 1950 | 132.4(20) min | β+ | 177Ta | 1/2−
|-id=Tungsten-178 | 178W | style="text-align:right" | 74 | style="text-align:right" | 104 | 177.945886(16) | style="text-align:center" | 1950 | 21.6(3) d | EC | 178Ta | 0+
|-id=Tungsten-178m | style="text-indent:1em" | 178mW | colspan="3" style="text-indent:2em" | 6572.7(3) keV | style="text-align:center" | 1995 | 220(10) ns | IT | 178W | 25+
|-id=Tungsten-179 | 179W | style="text-align:right" | 74 | style="text-align:right" | 105 | 178.947079(16) | style="text-align:center" | 1950 | 37.05(16) min | β+ | 179Ta | 7/2−
|-id=Tungsten-179m1 | rowspan=2 style="text-indent:1em" | 179m1W | rowspan=2 colspan="3" style="text-indent:2em" | 221.91(3) keV | rowspan=2 style="text-align:center" | 1950 | rowspan=2|6.40(7) min | IT (99.71%) | 179W | rowspan=2|1/2− | rowspan=2| | rowspan=2| |- | β+ (0.29%) | 179Ta |-id=Tungsten-179m2 | style="text-indent:1em" | 179m2W | colspan="3" style="text-indent:2em" | 1631.90(8) keV | style="text-align:center" | 1978 | 390(30) ns | IT | 179W | 21/2+
|-id=Tungsten-179m3 | style="text-indent:1em" | 179m3W | colspan="3" style="text-indent:2em" | 3348.41(14) keV | style="text-align:center" | 1978 | 750(80) ns | IT | 179W | 35/2−
|-id=Tungsten-180 | 180WPrimordial radionuclide | style="text-align:right" | 74 | style="text-align:right" | 106 | 179.9467133(15) | style="text-align:center" | 1937 | 1.59(5)×1018 y | α | 176Hf | 0+ | 0.0012(1) | |-id=Tungsten-180m1 | style="text-indent:1em" | 180m1W | colspan="3" style="text-indent:2em" | 1529.05(4) keV | style="text-align:center" | 1955 | 5.47(9) ms | IT | 180W | 8−
|-id=Tungsten-180m2 | style="text-indent:1em" | 180m2W | colspan="3" style="text-indent:2em" | 3264.7(3) keV | style="text-align:center" | 2002 | 2.33(19) μs | IT | 180W | 14−
|-id=Tungsten-181 | 181W | style="text-align:right" | 74 | style="text-align:right" | 107 | 180.9482187(16) | style="text-align:center" | 1947 | 120.956(19) d | EC | 181Ta | 9/2+
|-id=Tungsten-181m1 | style="text-indent:1em" | 181m1W | colspan="3" style="text-indent:2em" | 365.55(13) keV | style="text-align:center" | 1957 | 14.59(15) μs | IT | 181W | 5/2−
|-id=Tungsten-181m2 | style="text-indent:1em" | 181m2W | colspan="3" style="text-indent:2em" | 1653.0(3) keV | style="text-align:center" | 1973 | 200(13) ns | IT | 181W | 21/2+
|-id=Tungsten-182 | 182W | style="text-align:right" | 74 | style="text-align:right" | 108 | 181.94820564(80) | style="text-align:center" | 1930 | colspan=3 align=center|Observationally StableBelieved to undergo α decay to 178Hf with a half-life over 7.7×1021 y | 0+ | 0.2650(16) | |-id=Tungsten-182m | style="text-indent:1em" | 182mW | colspan="3" style="text-indent:2em" | 2230.65(14) keV | style="text-align:center" | 1969 | 1.3(1) μs | IT | 182W | 10+
|-id=Tungsten-183 | 183W | style="text-align:right" | 74 | style="text-align:right" | 109 | 182.95022442(80) | style="text-align:center" | 1930 | colspan=3 align=center|Observationally StableBelieved to undergo α decay to 179Hf with a half-life over 6.70×1020 y | 1/2− | 0.1431(4) | |-id=Tungsten-183m | style="text-indent:1em" | 183mW | colspan="3" style="text-indent:2em" | 309.492(4) keV | style="text-align:center" | 1961 | 5.30(8) s | IT | 183W | 11/2+
|-id=Tungsten-184 | 184W | style="text-align:right" | 74 | style="text-align:right" | 110 | 183.95093318(79) | style="text-align:center" | 1930 | colspan=3 align=center|Observationally StableBelieved to undergo α decay to 180Hf with a half-life over 8.9×1021 y | 0+ | 0.3064(2) | |-id=Tungsten-184m1 | style="text-indent:1em" | 184m1W | colspan="3" style="text-indent:2em" | 1284.997(8) keV | style="text-align:center" | 1966 | 8.33(18) μs | IT | 184W | 5−
|-id=Tungsten-184m2 | style="text-indent:1em" | 184m2W | colspan="3" style="text-indent:2em" | 4127.7(5) keV | style="text-align:center" | 2004 | 188(38) ns | IT | 184W | (14+)
|-id=Tungsten-185 | 185W | style="text-align:right" | 74 | style="text-align:right" | 111 | 184.95342121(79) | style="text-align:center" | 1940 | 75.1(3) d | β− | 185Re | 3/2−
|-id=Tungsten-185m | style="text-indent:1em" | 185mW | colspan="3" style="text-indent:2em" | 197.383(23) keV | style="text-align:center" | 1950 | 1.597(4) min | IT | 185W | 11/2+
|-id=Tungsten-186 | 186W | style="text-align:right" | 74 | style="text-align:right" | 112 | 185.9543651(13) | style="text-align:center" | 1930 | colspan=3 align=center|Observationally StableBelieved to undergo α decay to 182Hf with a half-life over 8.2×1021 y, or β−β− decay to 186Os with a half-life over 4.1×1018 y | 0+ | 0.2843(19) | |-id=Tungsten-186m1 | style="text-indent:1em" | 186m1W | colspan="3" style="text-indent:2em" | 1517.2(6) keV | style="text-align:center" | 1998 | 18(1) μs | IT | 186W | 7−
|-id=Tungsten-186m2 | style="text-indent:1em" | 186m2W | colspan="3" style="text-indent:2em" | 3542.8(21) keV | style="text-align:center" | 1998 | 2.0(2) s | IT | 186W | 16+
|-id=Tungsten-187 | 187W | style="text-align:right" | 74 | style="text-align:right" | 113 | 186.9571612(13) | style="text-align:center" | 1940 | 23.809(25) h | β− | 187Re | 3/2−
|-id=Tungsten-187m | style="text-indent:1em" | 187mW | colspan="3" style="text-indent:2em" | 410.06(4) keV | style="text-align:center" | 2005 | | IT | 187W | 11/2+
|-id=Tungsten-188 | 188W | style="text-align:right" | 74 | style="text-align:right" | 114 | 187.9584883(33) | style="text-align:center" | 1951 | 69.77(5) d | β− | 188Re | 0+