Why is rhodium so expensive?

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Tags

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2. #metals
3. #belongs
4. #platinum
5. #melting
6. #price
7. #boiling
8. #another
9. #being
10. #there
11. #because
12. #expensive
13. #noble
14. #qualities
15. #group
16. #reason
17. #reasons
18. #which
19. #rhodium
20. #precious