Copper
There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper; they both have a spin of 3/2. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours. Seven metastable isotopes have been characterized, with 68mCu the longest-lived with a half-life of 3.8 minutes. Isotopes with a mass number above 64 decay by b-, whereas those with a mass number below 64 decay by b+. 64Cu, which has a half-life of 12.7 hours, decays both ways.
What is the half life of the copper isotope 67Cu?
61.83 hours
The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours.
Copper