Scandium Group: Scandium 44.1 Yttrium 88.7 Cerite Earths: Lanthanum 139.0 Cerium 140.25 Prreseodymium 140.6 Neodymium 144.3 Samarium 150.4 Europium.. 152.0 Ytterbium Earths: Gadolinium 157.3 ...