Germanium is a semimetallic element in group 14 of the periodic table, with the atomic symbol Ge and atomic number 32. It is also a semiconductor, just like its sister element silicon.

Indium is a metallic element in group 13 of the periodic table, with the symbol "In" and atomic number 49. It is a soft, silvery-white metal that is rare in nature and is found in ores of lead and zinc.

Gallium is a metallic element in group 13 of the periodic table, with the symbol "Ga" and atomic number 31. It has a low melting point and is an anomalous liquid that remains in a liquid state at room temperature.