Holmium is a chemical element with the symbol Ho and atomic number 67. It is a rare earth metal that belongs to the lanthanide series on the periodic table. Holmium is known for its silvery-white appearance and is relatively soft and malleable. It is primarily used in various applications, including nuclear reactors and as a dopant in lasers. This element is notable for its magnetic properties, making it useful in the production of strong permanent magnets. Holmium is also employed in the field of medicine, particularly in surgery and medical imaging, due to its ability to produce specific wavelengths of light.