Context: Several dozen radioisotopes have been characterized. 65Zn, which has a half-life of 243.66 days, is the most long-lived radioisotope, followed by 72Zn with a half-life of 46.5 hours. Zinc has 10 nuclear isomers. 69mZn has the longest half-life, 13.76 h. The superscript m indicates a metastable isotope. The nucleus of a metastable isotope is in an excited state and will return to the ground state by emitting a photon in the form of a gamma ray. 61Zn has three excited states and 73Zn has two. The isotopes 65Zn, 71Zn, 77Zn and 78Zn each have only one excited state.

Question: How many radioisotopes of zinc have been discovered?
Answer: Several dozen

Question: What is the longest half life of the isotopes?
Answer: 243.66

Question: What does the superscript m represent?
Answer: metastable isotope

Question: How many excited states does 61Zn have? 
Answer: three

Question: How many excited states does 73Zn have?
Answer: two

Question: What is the most long lived radio isotope?
Answer: 65Zn

Question: What is the half life of 72Zn?
Answer: 46.5 hours

Question: How many nuclear isomers does zinc have?
Answer: 10

Question: What does the superscript "m" indicate?
Answer: metastable isotope

Question: What does a metastable isotope do to return to ground state from an excited state?
Answer: emitting a photon in the form of a gamma ray

Question: How many radioisotopes of zinc have been hidden?
Answer: Unanswerable

Question: What is the only half life of the isotopes?
Answer: Unanswerable

Question: How many boring states does 61Zn have?
Answer: Unanswerable

Question: How many nuclear isomers does zinc avoid?
Answer: Unanswerable