1. Praseodymium makes up 1 part per trillion of seawater.2. There is almost no praseodymium in the atmosphere. 3. However they were unable to make the cerium, praseodymium , and terbium nickelates. 4. Mischmetal, used in making cigarette lighters, historically contained about 5 % praseodymium metal. 5. Like most rare earth elements, praseodymium most readily forms trivalent Pr ( III ) ions. 6. Many of praseodymium 's industrial uses involve its use to filter yellow light from light sources. 7. It is the most common of the lanthanides, followed by neodymium, lanthanum, and praseodymium . 8. By contrast, at sufficiently high loadings, praseodymium glass is distinctly green, rather than pure yellow. 9. However, this model fails to address superconductivity in the homologue Pr123 ( praseodymium instead of yttrium ). 10. Praseodymium occurs in small quantities in Earth's crust ( 9.5 counter-current solvent extraction.
Mobile