the atomic number of an element is 9 it has 10 neutrons find the element from the periodic table what is what will be its mass number Share with your friends Share 0 Subho Saayon answered this Atomic number 9 is fluorine or f it's atomic mass is 19 2 View Full Answer Subho Saayon answered this Sorry it is Fluorine or F 0 Gursimran Singh answered this Flourine 1