Talk:Radon-222
Latest comment: 4 months ago by 129.104.241.162 in topic Comparison of three even-even nuclides with medium beta decay half-lives
![]() | A fact from Radon-222 appeared on Wikipedia's Main Page in the Did you know column on 10 March 2019 (check views). The text of the entry was as follows:
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Emanation symbol
editOne sometimes finds the symbol Em when this was the element's name; I wonder if it goes back to Rutherford? Double sharp (talk) 12:22, 3 February 2021 (UTC)
Comparison of three even-even nuclides with medium beta decay half-lives
editDecay process | Qβ (keV) | Spin change | Half-life (a) |
---|---|---|---|
202Pb → 202Tl | 49.7 | 0+ → 2− (ΔJΔπ = 2−, 1 forbidden unique) | 5.25×104 |
222Rn → 222Fr | 24 | 0+ → 2− (ΔJΔπ = 2−, 1 forbidden unique) | 6.7×104−2.4×108 (predicted) |
250Cm → 250Bk | 37.7 | 0+ → 2− (ΔJΔπ = 2−, 1 forbidden unique) | 1.04×105 |