M4 The Periodic Table: Halogens
Slide 5 of 45
DIAtoMIc
Fluorine is written as:  F2
 
All of the Halogens  are   DIATOMIC
= 2 (goes about in pairs)
A molecule of a halogen is made up of two atoms, and therefore their formulae are:
Fluorine, F2   Chlorine, Cl2 Bromine, Br2  Iodine, I2