Answer: (2,5,6 or B,E,F)
2/B: Isotopes have the same atomic number.
5/E: Isotopes are stable or radioactive.
6/F: Isotopes have different mass numbers.
Explanation: These are the right answers on edge.....im just double confirming that these are the right!! I got these right thx to the ppl above, so dont forget to thank them as well ^u^