1. Scandium (A.N. 21)...

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).

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