Assertion: einsteinium's proton | /r/CapableOf | pose limit
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text: Experiments and predictions suggest that the half-lives will then decrease, apart from 260Md with a half-life of 31.8 days, as spontaneous fission becomes the dominant decay mode due to the mutual repulsion of the protons posing a limit to the island of relative stability of long-lived nuclei in the actinide series.