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Isotopes of holmium : ウィキペディア英語版 | Isotopes of holmium Natural holmium (Ho) contains one stable isotope, 165Ho. A number of synthetic radioactive isotopes are known, the most stable one is 163Ho, with a half-life of 4,570 years. All other radioisotopes have half-lives not greater than 1.117 days in their ground states (although the metastable 166mHo has a half-life of about 1,200 years), and most have half-lives under 3 hours. Standard atomic mass: 164.93033(2) u.〔(Table of Standard Atomic Weights 2013 – CIAAW )〕 == Table ==
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