The technetium-99 isotope, $^{99}\text{Tc}$, is radioactive and has been detected in lobsters and seaweed close to nuclear fuel reprocessing plants. Which of the following statements about an atom of $^{99}\text{Tc}$ are correct?
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct