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- Appearance of Radium
- Ar (Symbol of Argon)
- 77 (Atomic Number of Iridium)
- Melting Point of Francium in °C
Eu
Europium
39 known isotopes (1 stable,
38 radioactive)
130Eu
Mass
129.964022 u
Abundance —
Half-life 0.90 milliseconds
Spin/Parity (1+)
Decay Mode(s) Proton emission (100%)
131Eu
Mass
130.957634 u
Abundance —
Half-life 17.8 milliseconds
Spin/Parity 3/2+
Decay Mode(s) Proton emission (89%), EC/β⁺ (11%)
132Eu
Mass
131.954696 u
Abundance —
Half-life Unknown
Spin/Parity —
Decay Mode(s) Proton emission (0%)
134Eu
Mass
133.946537 u
Abundance —
Half-life 0.5 seconds
Spin/Parity —
Decay Mode(s) EC/β⁺ (100%), ECP (0%)
135Eu
Mass
134.941870 u
Abundance —
Half-life 1.5 seconds
Spin/Parity —
Decay Mode(s) EC/β⁺ (100%)
136Eu
Mass
135.939620 u
Abundance —
Half-life 3.3 seconds
Spin/Parity (7+)
Decay Mode(s) EC/β⁺ (100%), β⁺p (0.09%)
137Eu
Mass
136.935431 u
Abundance —
Half-life 11 seconds
Spin/Parity (11/2-)
Decay Mode(s) EC/β⁺ (100%)
138Eu
Mass
137.933709 u
Abundance —
Half-life 12.1 seconds
Spin/Parity (6-)
Decay Mode(s) EC/β⁺ (100%)
139Eu
Mass
138.929792 u
Abundance —
Half-life 17.9 seconds
Spin/Parity (11/2)-
Decay Mode(s) EC/β⁺ (100%)
140Eu
Mass
139.928088 u
Abundance —
Half-life 1.51 seconds
Spin/Parity 1+
Decay Mode(s) EC/β⁺ (100%)
141Eu
Mass
140.924932 u
Abundance —
Half-life 40.7 seconds
Spin/Parity 5/2+
Decay Mode(s) EC/β⁺ (100%)
142Eu
Mass
141.923447 u
Abundance —
Half-life 2.34 seconds
Spin/Parity 1+
Decay Mode(s) EC/β⁺ (100%)
143Eu
Mass
142.920299 u
Abundance —
Half-life 2.59 m
Spin/Parity 5/2+
Decay Mode(s) EC/β⁺ (100%)
144Eu
Mass
143.918819 u
Abundance —
Half-life 10.2 seconds
Spin/Parity 1+
Decay Mode(s) EC/β⁺ (100%)
145Eu
Mass
144.916273 u
Abundance —
Half-life 5.93 d
Spin/Parity 5/2+
Decay Mode(s) EC/β⁺ (100%)
146Eu
Mass
145.917211 u
Abundance —
Half-life 4.61 d
Spin/Parity 4-
Decay Mode(s) EC/β⁺ (100%)
147Eu
Mass
146.916752 u
Abundance —
Half-life 24.1 d
Spin/Parity 5/2+
Decay Mode(s) Electron capture (99.9978%), α (0.0022%)
148Eu
Mass
147.918091 u
Abundance —
Half-life 54.5 d
Spin/Parity 5-
Decay Mode(s) EC/β⁺ (100%), α (9.4e-7%)
149Eu
Mass
148.917937 u
Abundance —
Half-life 93.1 d
Spin/Parity 5/2+
Decay Mode(s) Electron capture (100%)
150Eu
Mass
149.919707 u
Abundance —
Half-life 36.9 years
Spin/Parity 5-
Decay Mode(s) EC/β⁺ (100%)
151Eu
Mass
150.919857 u
Abundance 47.8100%
Half-life 1.7E+18 years
Spin/Parity 5/2+
Decay Mode(s) Unknown
152Eu
Mass
151.921751 u
Abundance —
Half-life 13.517 years
Spin/Parity 3-
Decay Mode(s) EC/β⁺ (72.08%), β⁻ (27.92%)
153Eu Stable
Mass
152.921237 u
Abundance 52.1900%
Half-life Stable
Spin/Parity 5/2+
Decay Mode(s) —
154Eu
Mass
153.922986 u
Abundance —
Half-life 8.601 years
Spin/Parity 3-
Decay Mode(s) β⁻ (99.982%), EC/β⁺ (0.018%)
155Eu
Mass
154.922900 u
Abundance —
Half-life 4.753 years
Spin/Parity 5/2+
Decay Mode(s) β⁻ (100%)
156Eu
Mass
155.924763 u
Abundance —
Half-life 15.19 d
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
157Eu
Mass
156.925433 u
Abundance —
Half-life 15.18 h
Spin/Parity 5/2+
Decay Mode(s) β⁻ (100%)
158Eu
Mass
157.927782 u
Abundance —
Half-life 45.9 m
Spin/Parity (1-)
Decay Mode(s) β⁻ (100%)
159Eu
Mass
158.929100 u
Abundance —
Half-life 18.1 m
Spin/Parity 5/2+
Decay Mode(s) β⁻ (100%)
160Eu
Mass
159.931837 u
Abundance —
Half-life 42.6 seconds
Spin/Parity (5-)
Decay Mode(s) β⁻ (100%)
161Eu
Mass
160.933664 u
Abundance —
Half-life 26 seconds
Spin/Parity —
Decay Mode(s) β⁻ (100%)
162Eu
Mass
161.936958 u
Abundance —
Half-life 10.6 seconds
Spin/Parity —
Decay Mode(s) β⁻ (100%)
163Eu
Mass
162.939266 u
Abundance —
Half-life 7.7 seconds
Spin/Parity —
Decay Mode(s) β⁻ (100%)
164Eu
Mass
163.942853 u
Abundance —
Half-life 4.15 seconds
Spin/Parity (3)
Decay Mode(s) β⁻ (100%)
165Eu
Mass
164.945540 u
Abundance —
Half-life 2.3 seconds
Spin/Parity —
Decay Mode(s) β⁻ (100%)
166Eu
Mass
165.949813 u
Abundance —
Half-life 1.7 seconds
Spin/Parity —
Decay Mode(s) β⁻ (100%)
167Eu
Mass
166.953011 u
Abundance —
Half-life 1.3 seconds
Spin/Parity (5/2+)
Decay Mode(s) β⁻ (100%)
168Eu
Mass
167.957863 u
Abundance —
Half-life 0.20 seconds
Spin/Parity (6-)
Decay Mode(s) β⁻ (100%)
169Eu
Mass
168.961717 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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