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- Dubnium
- Modulus of Fluorine
- Xe (Symbol of Xenon)
- 17 (Atomic Number of Chlorine)
- Speed Of Sound of Ruthenium in km/h
Pr
Praseodymium
39 known isotopes (1 stable,
38 radioactive)
121Pr
Mass
120.955393 u
Abundance —
Half-life 10 milliseconds
Spin/Parity (3/2)
Decay Mode(s) Proton emission (100%)
124Pr
Mass
123.942940 u
Abundance —
Half-life 1.2 seconds
Spin/Parity —
Decay Mode(s) EC/β⁺ (100%), ECP (0%)
125Pr
Mass
124.937659 u
Abundance —
Half-life 3.3 seconds
Spin/Parity —
Decay Mode(s) EC/β⁺ (100%)
126Pr
Mass
125.935240 u
Abundance —
Half-life 3.14 seconds
Spin/Parity GE 4
Decay Mode(s) EC/β⁺ (100%)
127Pr
Mass
126.930710 u
Abundance —
Half-life 4.2 seconds
Spin/Parity —
Decay Mode(s) EC/β⁺ (100%)
128Pr
Mass
127.928791 u
Abundance —
Half-life 2.84 seconds
Spin/Parity 4 5 6
Decay Mode(s) EC/β⁺ (100%)
129Pr
Mass
128.925095 u
Abundance —
Half-life 30 seconds
Spin/Parity (3/2+)
Decay Mode(s) EC/β⁺ (100%)
130Pr
Mass
129.923590 u
Abundance —
Half-life 40.0 seconds
Spin/Parity (5+)
Decay Mode(s) EC/β⁺ (100%)
131Pr
Mass
130.920235 u
Abundance —
Half-life 1.51 m
Spin/Parity (3/2+)
Decay Mode(s) EC/β⁺ (100%)
132Pr
Mass
131.919240 u
Abundance —
Half-life 1.6 m
Spin/Parity (2)+
Decay Mode(s) EC/β⁺ (100%)
133Pr
Mass
132.916331 u
Abundance —
Half-life 6.5 m
Spin/Parity (3/2+)
Decay Mode(s) EC/β⁺ (100%)
134Pr
Mass
133.915697 u
Abundance —
Half-life 17 m
Spin/Parity 2-
Decay Mode(s) EC/β⁺ (100%)
135Pr
Mass
134.913112 u
Abundance —
Half-life 24 m
Spin/Parity 3/2(+)
Decay Mode(s) EC/β⁺ (100%)
136Pr
Mass
135.912677 u
Abundance —
Half-life 13.1 m
Spin/Parity 2+
Decay Mode(s) EC/β⁺ (100%)
137Pr
Mass
136.910679 u
Abundance —
Half-life 1.28 h
Spin/Parity 5/2+
Decay Mode(s) EC/β⁺ (100%)
138Pr
Mass
137.910757 u
Abundance —
Half-life 1.45 m
Spin/Parity 1+
Decay Mode(s) EC/β⁺ (100%)
139Pr
Mass
138.908933 u
Abundance —
Half-life 4.41 h
Spin/Parity 5/2+
Decay Mode(s) EC/β⁺ (100%)
140Pr
Mass
139.909086 u
Abundance —
Half-life 3.39 m
Spin/Parity 1+
Decay Mode(s) EC/β⁺ (100%)
141Pr Stable
Mass
140.907660 u
Abundance 100.0000%
Half-life Stable
Spin/Parity 5/2+
Decay Mode(s) —
142Pr
Mass
141.910052 u
Abundance —
Half-life 19.12 h
Spin/Parity 2-
Decay Mode(s) β⁻ (99.9836%), Electron capture (0.0164%)
143Pr
Mass
142.910823 u
Abundance —
Half-life 13.57 d
Spin/Parity 7/2+
Decay Mode(s) β⁻ (100%)
144Pr
Mass
143.913311 u
Abundance —
Half-life 17.28 m
Spin/Parity 0-
Decay Mode(s) β⁻ (100%)
145Pr
Mass
144.914518 u
Abundance —
Half-life 5.984 h
Spin/Parity 7/2+
Decay Mode(s) β⁻ (100%)
146Pr
Mass
145.917688 u
Abundance —
Half-life 24.09 m
Spin/Parity (2-)
Decay Mode(s) β⁻ (100%)
147Pr
Mass
146.919007 u
Abundance —
Half-life 13.44 m
Spin/Parity (3/2+)
Decay Mode(s) β⁻ (100%)
148Pr
Mass
147.922130 u
Abundance —
Half-life 2.29 m
Spin/Parity 1-
Decay Mode(s) β⁻ (100%)
149Pr
Mass
148.923736 u
Abundance —
Half-life 2.26 m
Spin/Parity (5/2+)
Decay Mode(s) β⁻ (100%)
150Pr
Mass
149.926676 u
Abundance —
Half-life 6.19 seconds
Spin/Parity (1-)
Decay Mode(s) β⁻ (100%)
151Pr
Mass
150.928309 u
Abundance —
Half-life 18.90 seconds
Spin/Parity (3/2-)
Decay Mode(s) β⁻ (100%)
152Pr
Mass
151.931553 u
Abundance —
Half-life 3.57 seconds
Spin/Parity (4+)
Decay Mode(s) β⁻ (100%)
153Pr
Mass
152.933904 u
Abundance —
Half-life 4.29 seconds
Spin/Parity —
Decay Mode(s) β⁻ (100%)
154Pr
Mass
153.937885 u
Abundance —
Half-life 2.3 seconds
Spin/Parity (3+)
Decay Mode(s) β⁻ (100%)
155Pr
Mass
154.940509 u
Abundance —
Half-life 1.47 seconds
Spin/Parity —
Decay Mode(s) β⁻ (100%)
156Pr
Mass
155.944767 u
Abundance —
Half-life 0.444 seconds
Spin/Parity (1+)
Decay Mode(s) β⁻ (100%)
157Pr
Mass
156.948003 u
Abundance —
Half-life 0.295 seconds
Spin/Parity (3/2-)
Decay Mode(s) β⁻ (100%)
158Pr
Mass
157.952603 u
Abundance —
Half-life 0.181 seconds
Spin/Parity (5-)
Decay Mode(s) β⁻ (100%)
159Pr
Mass
158.956232 u
Abundance —
Half-life 0.13 seconds
Spin/Parity (3/2-)
Decay Mode(s) β⁻ (100%)
160Pr
Mass
159.961138 u
Abundance —
Half-life 0.17 seconds
Spin/Parity —
Decay Mode(s) β⁻ (100%)
161Pr
Mass
160.965121 u
Abundance —
Half-life Unknown
Spin/Parity —
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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