Jisho

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同位体
Wikipedia definition
1. Isotopes of copperCopper (Cu) has two stable isotopes, Cu and Cu, along with 27 radioisotopes. The most stable of these is Cu with a half-life of 61.83 hours. The least stable is Cu with a half-life of approximately 75 ns. Most have half-lives under a minute. Unstable copper isotopes with atomic masses below 63 tend to undergo β decay, while isotopes with atomic masses above 65 tend to undergo β decay. Cu decays by both β and β. Cu, Cu, Cu, Cu, and Cu each have one metastable isomer.
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