This element is found in period 2, group 15. this nonmetal is the fifth most abundant element in the universe and makes up 78% of earth’s atmosphere. what is the atomic number and name of this element? *

Choose all the answers that apply. fluorine (f) has an atomic number of 9 and an atomic weight of 18.99. fluorine has a. 9 protons b. 10 neutrons c. 18 electrons d. an atomic mass of 19 e. at least one isotope