Prazeodím je kemični element, ki ima v periodnem sistemu simbol Pr in atomsko število 59. Prazeodim je mehak kovinski element srebrne barve iz skupine lantanoidov. Nekako bolj je odporen proti koroziji na zraku kot evropij, lantan, cerij ali neodim, vendar razvije zeleno oksidno prevleko, ki na zraku odpada, ter tako izpostavi oksidaciji še več kovine. Zaradi tega je prazeodim treba shranjevati pod lahkim mineralnim oljem ali zapečatenega v plastiko ali steklo.

Sklici

  1. ↑ Meija, Juris; in sod. (2016). »Atomic weights of the elements 2013 (IUPAC Technical Report)«. Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
  2. ↑ Yttrium and all lanthanides except Ce and Pm have been observed in the oxidation state 0 in bis(1,3,5-tri-t-butylbenzene) complexes, see Cloke, F. Geoffrey N. (1993). »Zero Oxidation State Compounds of Scandium, Yttrium, and the Lanthanides«. Chem. Soc. Rev. 22: 17–24. doi:10.1039/CS9932200017. and Arnold, Polly L.; Petrukhina, Marina A.; Bochenkov, Vladimir E.; Shabatina, Tatyana I.; Zagorskii, Vyacheslav V.; Cloke (15. december 2003). »Arene complexation of Sm, Eu, Tm and Yb atoms: a variable temperature spectroscopic investigation«. Journal of Organometallic Chemistry. 688 (1–2): 49–55. doi:10.1016/j.jorganchem.2003.08.028.
  3. ↑ Chen, Xin; in sod. (13. december 2019). »Lanthanides with Unusually Low Oxidation States in the PrB3– and PrB4– Boride Clusters«. Inorganic Chemistry. 58 (1): 411–418. doi:10.1021/acs.inorgchem.8b02572. PMID 30543295.
  4. ↑ Jackson, M. (2000). »Magnetism of Rare Earth« (PDF). The IRM quarterly. 10 (3): 1.
  5. ↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. str. E110. ISBN 0-8493-0464-4.

Zunanje povezave


source: https://sl.wikipedia.org/wiki/Prazeodim