Protaktinij je kemični element, ki ima v periodnem sistemu simbol Pa in atomsko število 91.

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. ↑ Donohue, J. (1959). »On the crystal structure of protactinium metal«. Acta Crystallographica. 12 (9): 697. doi:10.1107/S0365110X59002031.
  3. ↑ Cverna, Fran, ur. (2002). »Chapter 2. Thermal Expansion«. ASM Ready Reference: Thermal Properties of Metals (PDF). ASM International. str. 11. ISBN 0871707683.
  4. ↑ Lide, D. R., ur. (2005). »Magnetic susceptibility of the elements and inorganic compounds«. CRC Handbook of Chemistry and Physics (PDF) (86. izd.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.
source: https://sl.wikipedia.org/wiki/Protaktinij