What are the atomic number and atomic mass number of fluorine atoms with 9 protons and 10 neutrons? if we could add a proton to a fluorine nucleus, would the result still be fluorine? what if we added a neutron to a fluorine nucleus? explain?

Number of protons give atomic number, so Atomic number is 9.
Atomic mass =number of protons +number of neutrons=9+10=19

If we add 1 proton, then atomic number is going to be 10, and it would be Neon,
because number protons define atomic number and so type of element.
If we add  neutron, atomic number is not going to change, so it still would be Fluorine, but isotope of Fluorine with different atomic mass that would be equal 20.

Ithink the answer is a or d.

7is b8 is d9 is c10 is a11 is d