Germanium is a type of semiconductor and is widely used in electronic devices.

Erbium is one of the rare earth elements.

Barium is one of the elements widely distributed in the earth's crust.

Samarium is one of the rare earth elements.

Gadolinium is the 64th element in the periodic table.

Lutetium is one of the rare earth elements.

Indium is one of the chemical elements, its symbol is In, and its atomic number is 49.

Thulium is a rare element, mainly used in the manufacture of lasers.

Hafnium is a chemical element with atomic number 72.

Cerium is one of the rare earth elements.