Chemical elements
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Fermium Isotopes






Proton number: 100


Stable Isotopes

There is no Fermium Stable isotopes known

Natural Radioactive isotopes

There is no Fermium Natural Radioactive isotopes known

Artificial Radioactive isotopes


Fermium radioactive isotope number 1: 242Fm
Neutrons: 142;
Jn: 0+;
Decay: SF ≤ 100.00 %;
t1/2: 0.0008s ≈ 0.80 ms;

Fermium radioactive isotope number 2: 243Fm
Neutrons: 143;
Jn: 7/2+;
Decay: α ≤ 100.00 %;
t1/2: 0.18s ;

Fermium radioactive isotope number 3: 244Fm
Neutrons: 144;
Jn: 0+;
Decay: SF ≤ 100.00 %;
t1/2: 0.0033s ≈ 3.30 ms;

Fermium radioactive isotope number 4: 245Fm
Neutrons: 145;
Jn: Unknown;
Decay: α ≤ 100.00 %
SF ≤ 0.10 %;
t1/2: 4.2s ;

Fermium radioactive isotope number 5: 246Fm
Neutrons: 146;
Jn: 0+;
Decay: α : 92.00 %
SF : 8.00 %
ε ≤ 1.00 %;
t1/2: 1.1s ;

Fermium radioactive isotope number 6: 247Fm
Neutrons: 147;
Jn: 7/2+;
Decay: ε ≤ 50.00 %
α ≥ 50.00 %;
t1/2: 29s ;

Fermium radioactive isotope number 7: 247Fm
Neutrons: 147;
Jn: 1/2+;
Decay: α ≤ 100.00 %;
t1/2: 4.3s ;

Fermium radioactive isotope number 8: 248Fm
Neutrons: 148;
Jn: 0+;
Decay: α : 93.00 %
ε : 7.00 %
SF : 0.10 %;
t1/2: 36s ;

Fermium radioactive isotope number 9: 249Fm
Neutrons: 149;
Jn: 7/2+;
Decay: ε : 67.00 %
α : 33.00 %;
t1/2: 156s ≈ 2.60 m;

Fermium radioactive isotope number 10: 250Fm
Neutrons: 150;
Jn: 0+;
Decay: α > 90.00 %
ε < 10.00 %
SF : 6.9E-3 %;
t1/2: 1800s ≈ 30.00 m;

Fermium radioactive isotope number 11: 250Fm
Neutrons: 150;
Jn: 0+;
Decay: IT ≥ 80.00 %
α < 20.00 %
SF ≤ 8.2E-5 %
ε;
t1/2: 1.8s ;

Fermium radioactive isotope number 12: 251Fm
Neutrons: 151;
Jn: 9/2-;
Decay: ε : 98.20 %
α : 1.80 %;
t1/2: 19080s ≈ 5.30 h;

Fermium radioactive isotope number 13: 252Fm
Neutrons: 152;
Jn: 0+;
Decay: α : 100.00 %
SF : 2.3E-3 %;
t1/2: 91404s ≈ 25.39 h;

Fermium radioactive isotope number 14: 253Fm
Neutrons: 153;
Jn: 1/2+;
Decay: ε : 88.00 %
α : 12.00 %;
t1/2: 259200s ≈ 3.00 d;

Fermium radioactive isotope number 15: 254Fm
Neutrons: 154;
Jn: 0+;
Decay: α : 99.94 %
SF : 0.06 %;
t1/2: 11664s ≈ 3.24 h;

Fermium radioactive isotope number 16: 255Fm
Neutrons: 155;
Jn: 7/2+;
Decay: α : 100.00 %
SF : 2.4E-5 %;
t1/2: 72252s ≈ 20.07 h;

Fermium radioactive isotope number 17: 256Fm
Neutrons: 156;
Jn: 0+;
Decay: SF : 91.90 %
α : 8.10 %;
t1/2: 9456s ≈ 2.63 h;

Fermium radioactive isotope number 18: 257Fm
Neutrons: 157;
Jn: 9/2+;
Decay: α : 99.79 %
SF : 0.21 %;
t1/2: 8683200s ≈ 100.50 d;

Fermium radioactive isotope number 19: 258Fm
Neutrons: 158;
Jn: 0+;
Decay: SF ≤ 100.00 %;
t1/2: 0.00037s ≈ 0.37 ms;

Fermium radioactive isotope number 20: 259Fm
Neutrons: 159;
Jn: Unknown;
Decay: SF : 100.00 %;
t1/2: 1.5s ;

Fermium radioactive isotope number 21: 260Fm
Neutrons: 160;
Jn: 0+;
Decay: SF : 100.00 %;
t1/2: 0.004s ≈ 4.00 ms;
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