Context: 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 β−, whereas those with a mass number below 64 decay by β+. 64Cu, which has a half-life of 12.7 hours, decays both ways.

Question: How many isotopes are there of copper?
Answer: 29

Question: What are the two stable isotopes of cooper?
Answer: 63Cu and 65Cu

Question: Which isotope makes up about 69% of natural copper?
Answer: 63Cu

Question: What is the half life of the copper isotope 68mCu?
Answer: 3.8 minutes

Question: What is the half life of the copper isotope 67Cu?
Answer: 61.83 hours

Question: How many isotopes are missing in copper?
Answer: Unanswerable

Question: What are the two dangerous isotopes of copper?
Answer: Unanswerable

Question: Which isotope makes up about 74% of natural copper?
Answer: Unanswerable

Question: What is the half life of the supernatural isotope 68mCu?
Answer: Unanswerable

Question: What is the orbital period of the copper isotope 67Cu?
Answer: Unanswerable