Dubnium (Db) is a synthetic element with the atomic number 105. It has several known isotopes, most of which are highly radioactive and have relatively short half-lives. The most studied isotopes of dubnium include: 1. **Dubnium-263 (Db-263)**: This is the most stable isotope of dubnium, with a half-life of about 34 seconds. It decays primarily through alpha decay.
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