Input interpretation
rare earth metals | valence
Summary
median | 3 highest | 4 (cerium and praseodymium) lowest | 3 (15 elements)
Categorized list
3 | dysprosium, erbium, europium, gadolinium, holmium, lanthanum, lutetium, neodymium, promethium, samarium, scandium, terbium, thulium, ytterbium, yttrium 4 | cerium, praseodymium