1. Scandium (A.N. 21) 2. Yttrium (A.N. 39) 3. Lanthanum (A.N. 57) 4. Cerium (A.N. 58) 5. Praseodymium (A.N. 59) 6. Neodymium (A.N. 60) 7. Promethium (A.N. 61) 8. Samarium (A.N. 62) 9. Europium (A.N. 63) 10. Gadolinium (A.N. 64) 11. Terbium (A.N. 65) 12. Dysprosium (A.N. 66) 13. Holmium (A.N. 67) 14. Erbium (A.N. 68) 15. Thulium (A.N. 69) 16. Ytterbium (A.N. 70) 17. Lutetium (A.N. 71).