With regard to the species 16O2-, 19F- and 20Ne, which of the following statements is correct?

Q. With regard to the species ¹⁶O^2-, ¹⁹F^– and ²⁰Ne, which of the following statements is correct?

1. All three species contain 10 electrons.
2. (b)The sum of the neutrons in all three species is 27.
3. The sum of the protons in all three species is 28.
4. Both ¹⁹F^– and ²⁰Ne contain 20 neutrons.
5. none of the above

Answer: All three species contain 10 electrons.