Neodymium (Nd) is a metallic chemical element with atomic number 60. It belongs to the group of metals called rare earth metals.
There are several naturally occurring neodymium isotopes, but the most abundant one is 142Nd, with 60 protons and 82 neutrons.
A major application of neodymium is in strong magnets. Particularly, the alloy Nd2Fe14B is the strongest known permanent magnet. Neodymium-based magnets are used in electronic devices like microphones, loudspeakers and computer hard drives.