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- Oganesson
- Hardness of Krypton
- Pu (Symbol of Plutonium)
- 107 (Atomic Number of Bohrium)
- Discovered of Lawrencium in day
Bk
Berkelium
18 known isotopes (0 stable,
18 radioactive)
233Bk
Mass
233.056652 u
Abundance —
Half-life 21 seconds
Spin/Parity —
Decay Mode(s) Unknown
234Bk
Mass
234.057322 u
Abundance —
Half-life 1.4E2 seconds
Spin/Parity —
Decay Mode(s) α (80%), Electron capture (20%)
236Bk
Mass
236.057479 u
Abundance —
Half-life 22 seconds
Spin/Parity (4+ 6-)
Decay Mode(s) EC/β⁺ (83%), α (17%), SF+EC+B+ (4%)
238Bk
Mass
238.058204 u
Abundance —
Half-life 144 seconds
Spin/Parity —
Decay Mode(s) EC/β⁺ (100%), SF+EC+B+ (0.048%)
239Bk
Mass
239.058239 u
Abundance —
Half-life Unknown
Spin/Parity (3/2- 7/2+)
Decay Mode(s) Electron capture (99%), Spontaneous fission (1%), α (1%)
240Bk
Mass
240.059758 u
Abundance —
Half-life 4.8 m
Spin/Parity —
Decay Mode(s) ECSF (0.002%)
241Bk
Mass
241.060098 u
Abundance —
Half-life 4.6 m
Spin/Parity (7/2+)
Decay Mode(s) Unknown
242Bk
Mass
242.061999 u
Abundance —
Half-life 7.0 m
Spin/Parity —
Decay Mode(s) EC/β⁺ (99.5%), α (0.5%)
243Bk
Mass
243.063006 u
Abundance —
Half-life 4.6 h
Spin/Parity (3/2-)
Decay Mode(s) EC/β⁺ (99.85%), α (0.15%)
244Bk
Mass
244.065179 u
Abundance —
Half-life 5.02 h
Spin/Parity (4-)
Decay Mode(s) Electron capture (99.994%), α (0.006%)
245Bk
Mass
245.066360 u
Abundance —
Half-life 4.95 d
Spin/Parity 3/2-
Decay Mode(s) Electron capture (99.88%), α (0.12%)
246Bk
Mass
246.068671 u
Abundance —
Half-life 1.80 d
Spin/Parity 2(-)
Decay Mode(s) EC/β⁺ (100%)
247Bk
Mass
247.070306 u
Abundance —
Half-life 1380 years
Spin/Parity 3/2-
Decay Mode(s) α (100%)
248Bk
Mass
248.073142 u
Abundance —
Half-life 9 years
Spin/Parity (6+ 8-)
Decay Mode(s) Unknown
249Bk
Mass
249.074983 u
Abundance —
Half-life 330 d
Spin/Parity 7/2+
Decay Mode(s) β⁻ (99.99855%), α (0.00145%), Spontaneous fission (4.7e-8%)
250Bk
Mass
250.078317 u
Abundance —
Half-life 3.212 h
Spin/Parity 2-
Decay Mode(s) β⁻ (100%)
251Bk
Mass
251.080761 u
Abundance —
Half-life 55.6 m
Spin/Parity (3/2-)
Decay Mode(s) β⁻ (100%)
253Bk
Mass
253.086880 u
Abundance —
Half-life 10 m
Spin/Parity —
Decay Mode(s) Unknown
Decay mode abbreviations:
β⁻ = Beta minus decay, β⁺ = Beta plus decay, EC = Electron capture, α = Alpha decay
n = Neutron emission, p = Proton emission, SF = Spontaneous fission, IT = Isomeric transition
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