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The element cobalt has one stable isotope: $^{59}$Co.
Chemists can construct several different isotopes of this element with varying numbers of neutrons. All are unstable; the five most stable are given in the following table (y=years, d=days, m=minutes).
Isotope | Half life |
$^{60}$Co | 5.2714 y |
$^{57}$Co | 271.79 d |
$^{56}$Co | 77.27 d |
$^{58}$Co | 70.86 d |
$^{55}$Co | 17.53 h |