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- Copernicium
- Electronegativity (pauling) of Promethium
- Mn (Symbol of Manganese)
- 108 (Atomic Number of Hassium)
- Melting Point of Iodine in °C
Sm
Samarium
40 known isotopes (5 stable,
35 radioactive)
129Sm
Mass
128.954557 u
Abundance —
Half-life 0.55 seconds
Spin/Parity (1/2+ 3/2+)
Decay Mode(s) EC/β⁺ (100%), ECP (0%)
130Sm
Mass
129.948792 u
Abundance —
Half-life Unknown
Spin/Parity 0+
Decay Mode(s) Unknown
131Sm
Mass
130.946022 u
Abundance —
Half-life 1.2 seconds
Spin/Parity —
Decay Mode(s) EC/β⁺ (100%), ECP (0%)
132Sm
Mass
131.940805 u
Abundance —
Half-life 4.0 seconds
Spin/Parity 0+
Decay Mode(s) EC/β⁺ (100%)
133Sm
Mass
132.938560 u
Abundance —
Half-life 2.89 seconds
Spin/Parity (5/2+)
Decay Mode(s) EC/β⁺ (100%), ECP (0%)
134Sm
Mass
133.934110 u
Abundance —
Half-life 9.5 seconds
Spin/Parity 0+
Decay Mode(s) EC/β⁺ (100%)
135Sm
Mass
134.932520 u
Abundance —
Half-life 10.3 seconds
Spin/Parity (3/2+ 5/2+)
Decay Mode(s) EC/β⁺ (100%), ECP (0.02%)
136Sm
Mass
135.928276 u
Abundance —
Half-life 47 seconds
Spin/Parity 0+
Decay Mode(s) EC/β⁺ (100%)
137Sm
Mass
136.927008 u
Abundance —
Half-life 45 seconds
Spin/Parity (9/2-)
Decay Mode(s) EC/β⁺ (100%)
138Sm
Mass
137.923244 u
Abundance —
Half-life 3.1 m
Spin/Parity 0+
Decay Mode(s) EC/β⁺ (100%)
139Sm
Mass
138.922297 u
Abundance —
Half-life 2.57 m
Spin/Parity 1/2+
Decay Mode(s) EC/β⁺ (100%)
140Sm
Mass
139.918995 u
Abundance —
Half-life 14.82 m
Spin/Parity 0+
Decay Mode(s) EC/β⁺ (100%)
141Sm
Mass
140.918482 u
Abundance —
Half-life 10.2 m
Spin/Parity 1/2+
Decay Mode(s) EC/β⁺ (100%)
142Sm
Mass
141.915209 u
Abundance —
Half-life 72.49 m
Spin/Parity 0+
Decay Mode(s) EC/β⁺ (100%)
143Sm
Mass
142.914635 u
Abundance —
Half-life 8.75 m
Spin/Parity 3/2+
Decay Mode(s) EC/β⁺ (100%)
144Sm Stable
Mass
143.912006 u
Abundance 3.0800%
Half-life Stable
Spin/Parity 0+
Decay Mode(s) —
145Sm
Mass
144.913417 u
Abundance —
Half-life 340 d
Spin/Parity 7/2-
Decay Mode(s) Electron capture (100%)
146Sm
Mass
145.913047 u
Abundance —
Half-life 6.8E+7 years
Spin/Parity 0+
Decay Mode(s) α (100%)
147Sm
Mass
146.914904 u
Abundance 15.0000%
Half-life 1.073E11 years
Spin/Parity 7/2-
Decay Mode(s) α (100%)
148Sm
Mass
147.914829 u
Abundance 11.2500%
Half-life 7E+15 years
Spin/Parity 0+
Decay Mode(s) α (100%)
149Sm Stable
Mass
148.917191 u
Abundance 13.8200%
Half-life Stable
Spin/Parity 7/2-
Decay Mode(s) —
150Sm Stable
Mass
149.917282 u
Abundance 7.3700%
Half-life Stable
Spin/Parity 0+
Decay Mode(s) —
151Sm
Mass
150.919939 u
Abundance —
Half-life 90 years
Spin/Parity 5/2-
Decay Mode(s) β⁻ (100%)
152Sm Stable
Mass
151.919739 u
Abundance 26.7400%
Half-life Stable
Spin/Parity 0+
Decay Mode(s) —
153Sm
Mass
152.922104 u
Abundance —
Half-life 46.284 h
Spin/Parity 3/2+
Decay Mode(s) β⁻ (100%)
154Sm Stable
Mass
153.922216 u
Abundance 22.7400%
Half-life Stable
Spin/Parity 0+
Decay Mode(s) —
155Sm
Mass
154.924647 u
Abundance —
Half-life 22.18 m
Spin/Parity 3/2-
Decay Mode(s) β⁻ (100%)
156Sm
Mass
155.925538 u
Abundance —
Half-life 9.4 h
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
157Sm
Mass
156.928419 u
Abundance —
Half-life 8.03 m
Spin/Parity (3/2-)
Decay Mode(s) β⁻ (100%)
158Sm
Mass
157.929949 u
Abundance —
Half-life 5.30 m
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
159Sm
Mass
158.933217 u
Abundance —
Half-life 11.37 seconds
Spin/Parity 5/2-
Decay Mode(s) β⁻ (100%)
160Sm
Mass
159.935337 u
Abundance —
Half-life 9.6 seconds
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
161Sm
Mass
160.939160 u
Abundance —
Half-life 4.8 seconds
Spin/Parity —
Decay Mode(s) β⁻ (100%)
162Sm
Mass
161.941622 u
Abundance —
Half-life 2.4 seconds
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
163Sm
Mass
162.945679 u
Abundance —
Half-life 1.23 seconds
Spin/Parity (1/2-)
Decay Mode(s) β⁻ (100%)
164Sm
Mass
163.948550 u
Abundance —
Half-life 1.43 seconds
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
165Sm
Mass
164.953290 u
Abundance —
Half-life 0.98 seconds
Spin/Parity (5/2-)
Decay Mode(s) β⁻ (100%)
166Sm
Mass
165.956575 u
Abundance —
Half-life 0.80 seconds
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
167Sm
Mass
166.962072 u
Abundance —
Half-life Unknown
Spin/Parity —
Decay Mode(s) β⁻ (100%)
168Sm
Mass
167.966033 u
Abundance —
Half-life Unknown
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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