Based on the atomic electronic layer structure and physicochemical properties of rare earth elements, as well as their characteristics in mineral formation and different ion radii that can produce different properties, the seventeen rare earth elements are usually divided into two groups:
Rare earths and materials
Rare earths and materials
Light rare earths include: lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium.
Heavy rare earths include gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, and yttrium