answer: Atomic number and number of protons
Fluorine is an element in periodic table. Fluorine has 9 protons. we know that atomic number of an atom is given by number of protons. Hence, the atomic number of Fluorine is 9. In a neutral atom, number of protons is equal to number of electrons but in the question no information is given on atom being neutral. The atomic mass is equal to the sum of number of neutrons and number of protons. No information is given about neutrons as well. So, we come to know only about atomic number and number of protons from the given information.
