Notable Isotopes 
172Hf [100 neutrons]
Abundance: synthetic
Half life: 1.87 years [ Electron Capture ]
Decay Energy: 0.350 MeVDecays to 172Lu.
174Hf [102 neutrons]Abundance: 0.162%
Half life: 2 x 1015 years [ Alpha Decay ]
Decay Energy: 2.495 MeVDecays to 170Yb.
176Hf [104 neutrons]Abundance: 5.206%
Stable with 104 neutrons
177Hf [105 neutrons]Abundance: 18.606%
Stable with 105 neutrons
178Hf [106 neutrons]Abundance: 27.297%
Stable with 106 neutrons
179Hf [107 neutrons]Abundance: 13.629%
Stable with 107 neutrons
180Hf [108 neutrons]Abundance: 35.1%
Stable with 108 neutrons
182Hf [110 neutrons]Abundance: synthetic
Half life: 9 x 106 years
Decay Energy: 0.373 MeVDecays to 182Ta.