Question

this is how fluorine appears in the periodic table. which is one piece of information that \9\ gives about an atom of fluorine? the atomic number the atomic mass the mass of neutrons the number of neutrons

Explanation:

In the periodic - table, the number above the element symbol represents the atomic number. For fluorine, the number 9 is its atomic number, which is the number of protons in the nucleus of a fluorine atom. The atomic mass is usually given below the element name (19.00 for fluorine here), and the number of neutrons is calculated as atomic mass - atomic number (approximately, for the most common isotope), and the mass of neutrons is a fixed value for a single neutron and not directly given by this number.

Answer:

the atomic number