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The precise number depends on uncertain theory far from known nuclei.","posed_since":"","precise":"Determine the number of nuclides with $Z \\le 120$ bound against one- and two-nucleon emission, with uncertainty propagated from energy density functionals and ab initio calculations. Erler et al. (2012) estimated $6900 \\pm 500$ using six Skyrme functionals. Answer: the count with model uncertainty below 300, and the regions of the chart dominating the uncertainty.","problem_ref":null,"references":"","settled_by":"Global mass models with Bayesian uncertainty quantification calibrated on drip-line data for Z up to 20.","status_note":"","title":"Total number of particle-bound 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