Practice problem
What are the seven diatomic elements?
Hydrogen, Iodine, Oxygen, Nitrogen, Flourine, Chlorine, Bromine
Mercury, Gold , Platinum, Hydrogen, Oxygen, Helium, Water
Uranium, Neptunium, Helium, Arsenic, Gallium, Boron, Neon
Type a concept, like “slope” or “photosynthesis”.