I am currently building up an element collection.Here is what I have so far:
Lithium
Oxygen
Hydrogen
Sodium
Potassium
Cadmium
Phosphorus
Lead
Carbon
Nitrogen
Chlorine
Bromine
Iodine
Magnesium
Silicon
Calcium
Iron
Zinc
Gallium
Aluminum
Lead
These are not all of the elements I have worked with,just the ones that I actually tried to collect purely for the element collection.