Chemical elements
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Francium Isotopes






Proton number: 87


Stable Isotopes

There is no Francium Stable isotopes known

Natural Radioactive isotopes

There is no Francium Natural Radioactive isotopes known

Artificial Radioactive isotopes


Francium radioactive isotope number 1: 199Fr
Neutrons: 112;
Jn: Unknown;
Decay: α > 0.00 %
ε;
t1/2: 0.012s ≈ 12.00 ms;

Francium radioactive isotope number 2: 200Fr
Neutrons: 113;
Jn: 3+;
Decay: α : 100.00 %;
t1/2: 0.049s ≈ 49.00 ms;

Francium radioactive isotope number 3: 200Fr
Neutrons: 113;
Jn: 10-;
Decay: α : 100.00 %;
t1/2: 0.57s ;

Francium radioactive isotope number 4: 201Fr
Neutrons: 114;
Jn: 9/2-;
Decay: α : 100.00 %;
t1/2: 0.062s ≈ 62.00 ms;

Francium radioactive isotope number 5: 201Fr
Neutrons: 114;
Jn: 1/2+;
Decay: α : 100.00 %;
t1/2: 0.019s ≈ 19.00 ms;

Francium radioactive isotope number 6: 202Fr
Neutrons: 115;
Jn: 3+;
Decay: α ~ 97.00 %
ε ~ 3.00 %;
t1/2: 0.23s ;

Francium radioactive isotope number 7: 202Fr
Neutrons: 115;
Jn: 10-;
Decay: α ~ 97.00 %
ε ~ 3.00 %;
t1/2: 0.23s ;

Francium radioactive isotope number 8: 203Fr
Neutrons: 116;
Jn: 9/2-;
Decay: α ≤ 100.00 %;
t1/2: 0.55s ;

Francium radioactive isotope number 9: 204Fr
Neutrons: 117;
Jn: 3+;
Decay: α ~ 80.00 %
ε ~ 20.00 %;
t1/2: 1.7s ;

Francium radioactive isotope number 10: 204Fr
Neutrons: 117;
Jn: 7+;
Decay: α ≤ 100.00 %;
t1/2: 2.6s ;

Francium radioactive isotope number 11: 204Fr
Neutrons: 117;
Jn: 10-;
Decay: α ≤ 100.00 % IT ;
t1/2: 1s ;

Francium radioactive isotope number 12: 205Fr
Neutrons: 118;
Jn: 9/2-;
Decay: α ≤ 100.00 %;
t1/2: 3.8s ;

Francium radioactive isotope number 13: 206Fr
Neutrons: 119;
Jn: 2+,3+;
Decay: α ~ 84.00 %
ε ~ 16.00 %;
t1/2: 16s ;

Francium radioactive isotope number 14: 206Fr
Neutrons: 119;
Jn: 7+;
Decay: α : 84.00 %
ε : 16.00 %;
t1/2: 15.9s ;

Francium radioactive isotope number 15: 206Fr
Neutrons: 119;
Jn: 10-;
Decay: α ~ 12.00 % IT ;
t1/2: 0.7s ;

Francium radioactive isotope number 16: 207Fr
Neutrons: 120;
Jn: 9/2-;
Decay: α : 95.00 %
ε : 5.00 %;
t1/2: 14.8s ;

Francium radioactive isotope number 17: 208Fr
Neutrons: 121;
Jn: 7+;
Decay: α : 90.00 %
ε : 10.00 %;
t1/2: 59.1s ;

Francium radioactive isotope number 18: 209Fr
Neutrons: 122;
Jn: 9/2-;
Decay: α : 89.00 %
ε : 11.00 %;
t1/2: 50s ;

Francium radioactive isotope number 19: 210Fr
Neutrons: 123;
Jn: 6+;
Decay: α : 60.00 %
ε : 40.00 %;
t1/2: 190.8s ≈ 3.18 m;

Francium radioactive isotope number 20: 211Fr
Neutrons: 124;
Jn: 9/2-;
Decay: α > 80.00 %
ε < 20.00 %;
t1/2: 186s ≈ 3.10 m;

Francium radioactive isotope number 21: 212Fr
Neutrons: 125;
Jn: 5+;
Decay: ε : 57.00 %
α : 43.00 %;
t1/2: 1200s ≈ 20.00 m;

Francium radioactive isotope number 22: 213Fr
Neutrons: 126;
Jn: 9/2-;
Decay: α : 99.45 %
ε : 0.55 %;
t1/2: 34.6s ;

Francium radioactive isotope number 23: 214Fr
Neutrons: 127;
Jn: 1-;
Decay: α : 100.00 %;
t1/2: 0.005s ≈ 5.00 ms;

Francium radioactive isotope number 24: 214Fr
Neutrons: 127;
Jn: 8-;
Decay: α : 100.00 %;
t1/2: 0.00335s ≈ 3.35 ms;

Francium radioactive isotope number 25: 215Fr
Neutrons: 128;
Jn: 9/2-;
Decay: α : 100.00 %;
t1/2: 8.6E-08s ≈ 86.00 ns;

Francium radioactive isotope number 26: 216Fr
Neutrons: 129;
Jn: 1-;
Decay: α : 100.00 %
ε < 2.0E-7 %;
t1/2: 7E-07s ≈ 0.70 µs;

Francium radioactive isotope number 27: 217Fr
Neutrons: 130;
Jn: 9/2-;
Decay: α : 100.00 %;
t1/2: 1.9E-05s ≈ 19.00 µs;

Francium radioactive isotope number 28: 218Fr
Neutrons: 131;
Jn: 1-;
Decay: α : 100.00 %;
t1/2: 0.001s ≈ 1.00 ms;

Francium radioactive isotope number 29: 218Fr
Neutrons: 131;
Jn: Unknown;
Decay: α ≤ 100.00 %
IT;
t1/2: 0.022s ≈ 22.00 ms;

Francium radioactive isotope number 30: 219Fr
Neutrons: 132;
Jn: 9/2-;
Decay: α : 100.00 %;
t1/2: 0.02s ≈ 20.00 ms;

Francium radioactive isotope number 31: 220Fr
Neutrons: 133;
Jn: 1+;
Decay: α : 99.65 %
β - : 0.35 %;
t1/2: 27.4s ;

Francium radioactive isotope number 32: 221Fr
Neutrons: 134;
Jn: 5/2-;
Decay: α : 100.00 %
β - < 0.10 %;
t1/2: 294s ≈ 4.90 m;

Francium radioactive isotope number 33: 222Fr
Neutrons: 135;
Jn: 2-;
Decay: β - : 100.00 %;
t1/2: 852s ≈ 14.20 m;

Francium radioactive isotope number 34: 223Fr
Neutrons: 136;
Jn: 3/2-;
Decay: β - : 99.99 %
α : 6.0E-3 %;
t1/2: 1320s ≈ 22.00 m;

Francium radioactive isotope number 35: 224Fr
Neutrons: 137;
Jn: 1-;
Decay: β - : 100.00 %;
t1/2: 199.8s ≈ 3.33 m;

Francium radioactive isotope number 36: 225Fr
Neutrons: 138;
Jn: 3/2-;
Decay: β - : 100.00 %;
t1/2: 237s ≈ 3.95 m;

Francium radioactive isotope number 37: 226Fr
Neutrons: 139;
Jn: 1-;
Decay: β - : 100.00 %;
t1/2: 49s ;

Francium radioactive isotope number 38: 227Fr
Neutrons: 140;
Jn: 1/2+;
Decay: β - : 100.00 %;
t1/2: 148.2s ≈ 2.47 m;

Francium radioactive isotope number 39: 228Fr
Neutrons: 141;
Jn: 2-;
Decay: β - ≤ 100.00 %;
t1/2: 38s ;

Francium radioactive isotope number 40: 229Fr
Neutrons: 142;
Jn: 1/2+;
Decay: β - : 100.00 %;
t1/2: 50.2s ;

Francium radioactive isotope number 41: 230Fr
Neutrons: 143;
Jn: Unknown;
Decay: β - : 100.00 %;
t1/2: 19.1s ;

Francium radioactive isotope number 42: 231Fr
Neutrons: 144;
Jn: 1/2+;
Decay: β - : 100.00 %;
t1/2: 17.6s ;

Francium radioactive isotope number 43: 232Fr
Neutrons: 145;
Jn: 5;
Decay: β - : 100.00 %;
t1/2: 5.5s ;
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