. 4.4 67 44. a . 6 1 444.. 70 La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb 89 00 91 117 9) 94 45 94 97. 98 6/ 100 101 102 Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Source: Mongolian Central Geological Laboratory Mining Department, Golomt Bank Elemen s discovered and studied in Mongolia Elem