1. lanthanum
2. cerium
3. praseodymium
4. neodymium
5. promethium
6. samarium
7. europium
8. gadolinium
9. terbium
10. dysprosium
11. holmium
12. erbium
13. thulium
14. ytterbium
15. actinium
16. thorium
17. protactinium
18. uranium
19. neptunium
20. plutonium
21. americium
22. curium
23. berkelium
24. californium
25. einsteinium
26. fermium
27.mendelevium
28. nobelium
2006-09-01 14:02:37 · 2 answers · asked by purpree17 2 in Education & Reference ➔ Homework Help
I believe these are all "rare earth" elements and are found in minerals in the earth. See http://en.wikipedia.org/wiki/Rare_earth_elements
2006-09-01 20:01:46 · answer #1 · answered by gp4rts 7 · 0⤊ 0⤋
Do you mean where are they derived from?
2006-09-01 21:59:36 · answer #2 · answered by breeziewmkg 2 · 0⤊ 0⤋