1. Diatomic Molecules

2. Nitrogen gas molecules

3. A Collection of Argon Atoms

4. Oxygen gas molecules

5. Diatomic Molecules HOBrFINCl twinsH 2 O 2 Br 2 F 2 I 2 N 2 Cl 2 Hydrogen (H 2 ) atomic radius = 37 pm Fluorine (F 2 ) atomic radius = 64 pm Oxygen (O 2 ) atomic radius = 66 pm Nitrogen (N 2 ) atomic radius = 71 pm Chlorine (Cl 2 ) atomic radius = 99 pm Bromine (Br 2 ) atomic radius = 114 pm Iodine (I 2 ) atomic radius = 138 pm Distance between nuclei Nucleus Atomic radius

7. Diatomic Molecules Elements That Exist as Diatomic Molecules in Their Elemental Forms Element PresentElemental State at 25 o C Molecule hydrogen colorless gas H 2 nitrogen colorless gas N 2 oxygen pale blue gas O 2 fluorine pale yellow gas F 2 chlorine pale green gas Cl 2 bromine reddish-brown liquid Br 2 iodine lustrous, dark purple solid I 2