S Sulfur
Contributed by collector no. 6
Powdered Sulfur in a container labeled with its symbol, atomic number, and its atomic weight
Small chunk of Sulfur
K Potassium
Heavily oxidized chunk of Potassium metal in a bottle of oil, itself in what appears to be a sealed bag
Cu Copper
Several forms of Copper metal!
Inductor made from Copper coils
Ga Gallium
Small sample of Gallium
A different sample of Gallium metal
A sample of Gallium in a vial itself inside a bottle. Orange construction paper is fixed on the outer bottle with the symbol "Ga" and the electron shell.
Close-up photo of Gallium in the cap of a bottle
Hf Hafnium
1 gram of Hafnium slugs
Bi Bismuth
Small brassy crystals of Bismuth with rainbow sheen in some places