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Krypton-81 is useful in determining how old the water beneath the ground is. [10] Radioactive krypton-81 is the product of spallation reactions with cosmic rays striking gases present in the Earth atmosphere, along with the six stable or nearly stable krypton isotopes. [11] Krypton-81 has a half-life of about 229,000 years.
Hydrogen (1 H) has three naturally occurring isotopes: 1 H, 2 H, and 3 H. 1 H and 2 H are stable, while 3 H has a half-life of 12.32(2) years. [3] [nb 1] Heavier isotopes also exist; all are synthetic and have a half-life of less than 1 zeptosecond (10 −21 s). [4] [5] Of these, 5 H is the least stable, while 7 H is the most.
Naturally occurring krypton in Earth's atmosphere is composed of five stable isotopes, plus one isotope (78 Kr) with such a long half-life (9.2×10 21 years) that it can be considered stable. (This isotope has the third-longest known half-life among all isotopes for which decay has been observed; it undergoes double electron capture to 78 Se ).
This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.
Krypton has several isotopes, with 78, 80, 82 Kr being primordial, while 83,84, 86 Kr results from spontaneous fission of 244 Pu and radiogenic decay of 238 U. [113] [97] Krypton's isotopes geochemical signature in mantle reservoirs resembling the modern atmosphere. preserves the solar-like primordial signature. [114]
81 Br: 81m Kr synth 13.10 s: IT: 81 Kr ... Main isotopes of krypton; Main isotopes [1] Decay; ... 0.9995|u=%}} (e.g., hydrogen) Do not add uncertainties "(5)" or "±0 ...
Whoopi Goldberg and “The View” co-hosts came to Travis Kelce’s defense ahead of Super Bowl LIX, where the Kansas City Chiefs tight end will be facing off against the Philadelphia Eagles.
Of the 26 "monoisotopic" elements that have only a single stable isotope, all but one have an odd atomic number—the single exception being beryllium. In addition, no odd-numbered element has more than two stable isotopes, while every even-numbered element with stable isotopes, except for helium, beryllium, and carbon, has at least three.