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Isotopes_of_barium entered the ranking for the first time today at position #. This is its highest position ever recorded.
This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-04-29 and was most recently seen on 2026-04-29.
Naturally occurring barium (56Ba) is a mix of six stable isotopes and one very long-lived radioactive primordial isotope, barium-130, identified as being unstable by geochemical means (from analysis of the presence of its daughter xenon-130 in rocks) in 2001, presumably decaying by double electron capture with a half-life of (0.5–2.7)×1021 years (about 1011 times the age of the universe). The two measurements are discordant; the above reflects the total range, the value in the table below is a crude average.
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