Which of the following atoms contains the same number of neutrons as an atom of Fluorine-19?

Neon-20
Oxygen-19

Sodium-22

Nitrogen-16

In Flourine-19, you can determine that the number of Neutrons is 10.

Now, if you look at Neon-20, you subtract its mass by the number of protons, leaving you with 10.

Therefore, Neon-20 has the same number of neutrons as Flourine-19.