Isotopes of barium Isotopes of barium Naturally occurring barium (Ba) is a mix of six stable isotopes and one very long-lived radioactive primordial isotope, barium-130, recently identified as being unstable by geochemical means (from analysis of the presence of its daughter xenon-130 in rocks). This nuclide decays by double-electron capture (absorbing two electrons and emitting two neutrinos); with a half-life of (0.5–2.7)×10 years (about 10 times the age of the universe). There are a total of thirty-three known radioisotopes in addition to Ba, but most of these are highly radioactive with half-lives in the several millisecond to several minute range. The only notable
Metallic dragon and adamantine dragons for brass and bronze, and released the latter dragons in a later book alongside cobalt, mercury, mithral, orium, and steel dragons. The classification of "metallic dragons" was used in the "Advanced Dungeons & Dragons" second edition "Monstrous Manual" (1993), although the gold(en) dragon first appeared in the original "Dungeons & Dragons" "white box" set (1974) and the other dragons comprising the category had been in print since the first edition "Monster Manual" (1977). The term was continued in use in the third edition and fourth edition "Monster Manual". Although weaker than many other varieties of dragonkind, brass