A | B | C | D | E | F | G | H | CH | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
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| Standard atomic weight Ar°(Kr) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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There are 34 known isotopes of krypton (36Kr) with atomic mass numbers from 69 through 102.[5][6] Naturally occurring krypton is made of five stable isotopes and one (78
Kr
) which is slightly radioactive with an extremely long half-life, plus traces of radioisotopes that are produced by cosmic rays in the atmosphere.
List of isotopes
| Nuclide [n 1] |
Z | N | Isotopic mass (Da) [n 2][n 3] |
Half-life [n 4][n 5] |
Decay mode [n 6] |
Daughter isotope [n 7][n 8] |
Spin and parity [n 9][n 5] |
Natural abundance (mole fraction) | |
|---|---|---|---|---|---|---|---|---|---|
| Excitation energy | Normal proportion | Range of variation | |||||||
| 69Kr | 36 | 33 | 68.96518(43)# | 32(10) ms | β+ | 69Br | 5/2−# | ||
| 70Kr | 36 | 34 | 69.95526(41)# | 52(17) ms | β+ | 70Br | 0+ | ||
| 71Kr | 36 | 35 | 70.94963(70) | 100(3) ms | β+ (94.8%) | 71Br | (5/2)− | ||
| β+, p (5.2%) | 70Se | ||||||||
| 72Kr | 36 | 36 | 71.942092(9) | 17.16(18) s | β+ | 72Br | 0+ | ||
| 73Kr | 36 | 37 | 72.939289(7) | 28.6(6) s | β+ (99.32%) | 73Br | 3/2− | ||
| β+, p (.68%) | 72Se | ||||||||
| 73mKr | 433.66(12) keV | 107(10) ns | (9/2+) | ||||||
| 74Kr | 36 | 38 | 73.9330844(22) | 11.50(11) min | β+ | 74Br | 0+ | ||
| 75Kr | 36 | 39 | 74.930946(9) | 4.29(17) min | β+ | 75Br | 5/2+ | ||
| 76Kr | 36 | 40 | 75.925910(4) | 14.8(1) h | β+ | 76Br | 0+ | ||
| 77Kr | 36 | 41 | 76.9246700(21) | 74.4(6) min | β+ | 77Br | 5/2+ | ||
| 78Kr[n 10] | 36 | 42 | 77.9203648(12) | 9.2 +5.5 −2.6 ±1.3×1021 y[2] |
Double EC | 78Se | 0+ | 0.00355(3) | |
| 79Kr | 36 | 43 | 78.920082(4) | 35.04(10) h | β+ | 79Br | 1/2− | ||
| 79mKr | 129.77(5) keV | 50(3) s | 7/2+ | ||||||
| 80Kr | 36 | 44 | 79.9163790(16) | Stable | 0+ | 0.02286(10) | |||
| 81Kr[n 11] | 36 | 45 | 80.9165920(21) | 2.29(11)×105 y | EC | 81Br | 7/2+ | trace | |
| 81mKr | 190.62(4) keV | 13.10(3) s | IT (99.975%) | 81Kr | 1/2− | ||||
| EC (.025%) | 81Br | ||||||||
| 82Kr | 36 | 46 | 81.9134836(19) | Stable | 0+ | 0.11593(31) | |||
| 83Kr[n 12] | 36 | 47 | 82.914136(3) | Stable | 9/2+ | 0.11500(19) | |||
| 83m1Kr | 9.4053(8) keV | 154.4(11) ns | 7/2+ | ||||||
| 83m2Kr | 41.5569(10) keV | 1.83(2) h | IT | 83Kr | 1/2− | ||||
| 84Kr[n 12] | 36 | 48 | 83.911507(3) | Stable | 0+ | 0.56987(15) | |||
| 84mKr | 3236.02(18) keV | 1.89(4) μs | 8+ | ||||||
| 85Kr[n 12] | 36 | 49 | 84.9125273(21) | 10.776(3) y | β− | 85Rb | 9/2+ | trace | |
| 85m1Kr | 304.871(20) keV | 4.480(8) h | β− (78.6%) | 85Rb | 1/2− | ||||
| IT (21.4%) | 85Kr | ||||||||
| 85m2Kr | 1991.8(13) keV | 1.6(7) μs |
(17/2+) | ||||||
| 86Kr[n 13][n 12] | 36 | 50 | 85.91061073(11) | Observationally Stable[n 14] | 0+ | 0.17279(41) | |||
| 87Kr | 36 | 51 | 86.91335486(29) | 76.3(5) min | β− | 87Rb | 5/2+ | ||
| 88Kr | 36 | 52 | 87.914447(14) | 2.84(3) h | β− | 88Rb | 0+ | ||
| 89Kr[n 12] | 36 | 53 | 88.91763(6) | 3.15(4) min | β− | 89Rb | 3/2(+#) | ||
| 90Kr | 36 | 54 | 89.919517(20) | 32.32(9) s | Zdroj:https://en.wikipedia.org?pojem=Krypton-81m|||||