What are two ways to write an isotope of fluorine with 9 neutrons and no protons

If it has no protons then it's not Fluorine and thus not an isotope of Fluorine.  In fact if an atom has no protons than it's not even an element since Hydrogen has at 1 proton.  

answer: i'm not sure which is which for i get confused on it all the time but i can tell you that the answer lies with the convex and concave devices. i hope this you. have a good day and best of luck to you!

explanation:

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.