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- Niobium
- Electrons Per Shell of Neon
- Ce (Symbol of Cerium)
- 11 (Atomic Number of Sodium)
- Ionization Energies of Silver in J/mol
Ra
Radium
34 known isotopes (0 stable,
34 radioactive)
201Ra
Mass
201.012815 u
Abundance —
Half-life 8 milliseconds
Spin/Parity 3/2-
Decay Mode(s) α (100%)
202Ra
Mass
202.009742 u
Abundance —
Half-life 16 milliseconds
Spin/Parity 0+
Decay Mode(s) α (100%)
203Ra
Mass
203.009234 u
Abundance —
Half-life 31 milliseconds
Spin/Parity 3/2-
Decay Mode(s) α (100%)
204Ra
Mass
204.006507 u
Abundance —
Half-life 57 milliseconds
Spin/Parity 0+
Decay Mode(s) α (100%)
205Ra
Mass
205.006231 u
Abundance —
Half-life 210 milliseconds
Spin/Parity (3/2-)
Decay Mode(s) α (100%)
206Ra
Mass
206.003828 u
Abundance —
Half-life 0.24 seconds
Spin/Parity 0+
Decay Mode(s) α (100%)
207Ra
Mass
207.003772 u
Abundance —
Half-life 1.35 seconds
Spin/Parity (3/2- 5/2-)
Decay Mode(s) α (86%), EC/β⁺ (14%)
208Ra
Mass
208.001855 u
Abundance —
Half-life 1.3 seconds
Spin/Parity 0+
Decay Mode(s) α (95%), EC/β⁺ (5%)
209Ra
Mass
209.001995 u
Abundance —
Half-life 4.8 seconds
Spin/Parity 5/2-
Decay Mode(s) α (100%)
210Ra
Mass
210.000475 u
Abundance —
Half-life 3.7 seconds
Spin/Parity 0+
Decay Mode(s) α (96%), EC/β⁺ (4%)
211Ra
Mass
211.000893 u
Abundance —
Half-life 13 seconds
Spin/Parity 5/2(-)
Decay Mode(s) α (93%), EC/β⁺ (7%)
212Ra
Mass
211.999787 u
Abundance —
Half-life 13.0 seconds
Spin/Parity 0+
Decay Mode(s) α (85%), EC/β⁺ (15%)
213Ra
Mass
213.000371 u
Abundance —
Half-life 2.73 m
Spin/Parity 1/2-
Decay Mode(s) α (86%), EC/β⁺ (14%)
214Ra
Mass
214.000100 u
Abundance —
Half-life 2.438 seconds
Spin/Parity 0+
Decay Mode(s) α (99.941%), Electron capture (0.059%)
215Ra
Mass
215.002718 u
Abundance —
Half-life 1.66 milliseconds
Spin/Parity (9/2+)
Decay Mode(s) α (100%)
216Ra
Mass
216.003534 u
Abundance —
Half-life 182 nanoseconds
Spin/Parity 0+
Decay Mode(s) α (100%), Electron capture (1e-8%)
217Ra
Mass
217.006323 u
Abundance —
Half-life 1.6 microseconds
Spin/Parity (9/2+)
Decay Mode(s) α (100%)
218Ra
Mass
218.007134 u
Abundance —
Half-life 25.91 microseconds
Spin/Parity 0+
Decay Mode(s) α (100%)
219Ra
Mass
219.010085 u
Abundance —
Half-life 9 milliseconds
Spin/Parity (7/2+)
Decay Mode(s) α (100%)
220Ra
Mass
220.011028 u
Abundance —
Half-life 18 milliseconds
Spin/Parity 0+
Decay Mode(s) α (100%)
221Ra
Mass
221.013917 u
Abundance —
Half-life 28 seconds
Spin/Parity 5/2+
Decay Mode(s) α (100%)
222Ra
Mass
222.015373 u
Abundance —
Half-life 38.0 seconds
Spin/Parity 0+
Decay Mode(s) α (100%), 14C (3e-8%)
223Ra
Mass
223.018501 u
Abundance —
Half-life 11.43 d
Spin/Parity 3/2+
Decay Mode(s) α (100%), 14C (8.9e-8%), 14C (7.7e-8%)
224Ra
Mass
224.020210 u
Abundance —
Half-life 3.6316 d
Spin/Parity 0+
Decay Mode(s) α (100%), 14C (4e-9%)
225Ra
Mass
225.023611 u
Abundance —
Half-life 14.9 d
Spin/Parity 1/2+
Decay Mode(s) β⁻ (100%), α (0.026%)
226Ra
Mass
226.025408 u
Abundance —
Half-life 1600 years
Spin/Parity 0+
Decay Mode(s) α (100%), 14C (3.2e-9%)
227Ra
Mass
227.029176 u
Abundance —
Half-life 42.2 m
Spin/Parity 3/2+
Decay Mode(s) β⁻ (100%)
228Ra
Mass
228.031069 u
Abundance —
Half-life 5.75 years
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
229Ra
Mass
229.034957 u
Abundance —
Half-life 4.0 m
Spin/Parity 5/2+
Decay Mode(s) β⁻ (100%), α (100%)
230Ra
Mass
230.037055 u
Abundance —
Half-life 93 m
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
231Ra
Mass
231.041027 u
Abundance —
Half-life 103.9 seconds
Spin/Parity (5/2+)
Decay Mode(s) β⁻ (100%)
232Ra
Mass
232.043475 u
Abundance —
Half-life 4.2 m
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
233Ra
Mass
233.047595 u
Abundance —
Half-life 30 seconds
Spin/Parity (1/2+)
Decay Mode(s) β⁻ (100%)
234Ra
Mass
234.050382 u
Abundance —
Half-life 30 seconds
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
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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