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 mass is different than the atomic number, and the number of neutrons is the difference between the atomic mass and the atomic number. the atomic number the atomic mass the mass of protons the number of neutrons
As you move down a column : * the atomic number increases * the number of protims increases * the atomic mass increases * the electronegativity decreases
