It's Elemental - Isotopes of the Element Mercury

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Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Isotopes of the Element Mercury with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

196	0.15%	Stable

198	9.97%	Stable

199	16.87%	Stable

200	23.10%	Stable

201	13.18%	Stable

202	29.86%	Stable

204	6.87%	Stable

All Known Isotopes of the Element Mercury

Mass Number	Half-life	Decay Mode	Branching Percentage

172	0.25 milliseconds	Alpha Decay	No Data Available

173	0.93 milliseconds	Alpha Decay	No Data Available

174	2.1 milliseconds	Alpha Decay	99.60

175	8 milliseconds	Alpha Decay	100.00

176	34 milliseconds	Alpha Decay	~ 100.00

177	0.114 seconds	Alpha Decay	85.00

		Electron Capture	15.00

178	0.287 seconds	Alpha Decay	~ 70.00

		Electron Capture	~ 30.00

179	0.93 seconds	Alpha Decay	~ 53.00

		Electron Capture	~ 47.00

		Electron Capture with delayed Proton Emission	~ 0.15

180	2.6 seconds	Electron Capture	52.00

		Alpha Decay	48.00

181	3.6 seconds	Electron Capture	69.00

		Alpha Decay	31.00

		Electron Capture with delayed Proton Emission	0.02

		Electron Capture with delayed Alpha Decay	1.1E-5

182	10.83 seconds	Electron Capture	84.80

		Alpha Decay	15.20

183	9.4 seconds	Electron Capture	88.30

		Alpha Decay	11.70

		Electron Capture with delayed Proton Emission	2.6E-4

184	30.9 seconds	Electron Capture	98.89

		Alpha Decay	1.11

185	49.1 seconds	Electron Capture	94.00

		Alpha Decay	6.00

185_m	21.6 seconds	Isomeric Transition	54.00

		Electron Capture	46.00

		Alpha Decay	~ 0.03

186	1.38 minutes	Electron Capture	99.98

		Alpha Decay	0.02

187	2.4 minutes	Electron Capture	100.00

		Alpha Decay	> 1.2E-4

187_m	1.9 minutes	Electron Capture	100.00

		Alpha Decay	> 2.5E-4

188	3.25 minutes	Electron Capture	100.00

		Alpha Decay	3.7E-5

189	7.6 minutes	Electron Capture	100.00

		Alpha Decay	< 3.0E-5

189_m	8.6 minutes	Electron Capture	100.00

		Alpha Decay	< 3.0E-5

190	20.0 minutes	Electron Capture	100.00

		Alpha Decay	< 5.0E-5

191	49 minutes	Electron Capture	100.00

191_m	50.8 minutes	Electron Capture	100.00

192	4.85 hours	Electron Capture	100.00

193	3.80 hours	Electron Capture	100.00

193_m	11.8 hours	Electron Capture	92.80

		Isomeric Transition	7.20

194	444 years	Electron Capture	100.00

195	9.9 hours	Electron Capture	100.00

195_m	41.6 hours	Isomeric Transition	54.20

		Electron Capture	45.80

196	Stable	-	-

197	64.14 hours	Electron Capture	100.00

197_m	23.8 hours	Isomeric Transition	91.40

		Electron Capture	8.60

198	Stable	-	-

199	Stable	-	-

199_m	42.6 minutes	Isomeric Transition	100.00

200	Stable	-	-

201	Stable	-	-

202	Stable	-	-

203	46.612 days	Beta-minus Decay	100.00

204	Stable	-	-

205	5.2 minutes	Beta-minus Decay	100.00

206	8.15 minutes	Beta-minus Decay	100.00

207	2.9 minutes	Beta-minus Decay	100.00

208	41 minutes	Beta-minus Decay	100.00