Ευγενή μέταλλα

Ευγενή μέταλλα όπως ο χρυσός και το παλλάδιο, μαζί με το μη ευγενές μέταλλο του χαλκού, διατεταγμένα σύμφωνα με τη θέση τους στον περιοδικό πίνακα των στοιχείων.

Ευγενή μέταλλα είναι τα μέταλλα τα οποία είναι ανθεκτικά στη διάβρωση και την οξείδωση στον υγρό αέρα, σε αντίθεση με τα περισσότερα βασικά μέταλλα. Έχουν την τάση να είναι πολύτιμα, συχνά λόγω της σπανιότητάς τους στο φλοιό της Γης. Ως ευγενή μέταλλα θεωρούνται (κατ 'αύξουσα σειρά ατομικού αριθμού) τα εξής: ρουθήνιο, ρόδιο, παλλάδιο, ασήμι, όσμιο, ιρίδιο, λευκόχρυσος και χρυσός. [1]

Άλλες πηγές περιλαμβάνουν ως ευγενή μέταλλα τον υδράργυρο [2][3], ή ακόμα και το ρήνιο. [4] Από την άλλη πλευρά, το τιτάνιο, νιόβιο και ταντάλιο δεν ονομάζονται ευγενή μέταλλα παρά το γεγονός ότι είναι πολύ ανθεκτικά στη διάβρωση.

Τα ευγενή μέταλλα δεν πρέπει να συγχέονται με τα πολύτιμα μέταλλα, αν και αρκετά ευγενή μέταλλα είναι πολύτιμα.


Παραπομπές

  1. ↑ A. Holleman, N. Wiberg, "Lehrbuch der Anorganischen Chemie", de Gruyter, 1985, 33. edition, p. 1486
  2. ↑ "Dictionary of Mining, Mineral, and Related Terms", Compiled by the American Geological Institute, 2nd edition, 1997
  3. ↑ Scoullos, M.J., Vonkeman, G.H., Thornton, I., Makuch, Z., "Mercury - Cadmium - Lead: Handbook for Sustainable Heavy Metals Policy and Regulation",Series: Environment & Policy, Vol. 31, Springer-Verlag, 2002
  4. ↑ The New Encyclopedia Britannica, 15th edition, Vol. VII, 1976


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