What is the mass of an atom that has 9 protons, 11 neutrons, and 10 electrons

By looking at the periodic table, you will see that Fluorine has 9 protons. Since the number of electrons equal the number of protons, Fluorine has 9 electrons as well. Meanwhile, it's mass number of 19, minus 10 neutrons, gives you 9 protons or electrons. Hence, the atom would be Fluorine.

Explanation:

19 u

Explanation:

by looking at the periodic table you see fluorine has 9 protons and 9 electrons. mass is 19u

the answer is c. nacl