Short answers, pulled from the story.
Carl Auer von Welsbach discovered praseodymium in 1885 when he split didymium into two distinct components. This event marked the end of a thirty-year scientific mystery that began when a Swedish chemist first isolated didymium in 1841.
The name praseodymium is derived from the Greek words for leek and twin. Carl Auer von Welsbach chose this name because the element produced salts that glowed with the exact hue of a leek and acknowledged its close relationship to the other half of the split, neodymium.
Praseodymium is used in fiber optical amplifiers, lasers, and phosphors for red, green, blue, and ultraviolet displays. It forms high-power magnets with neodymium that are essential for electric vehicles and wind turbines that power the renewable energy revolution.
Praseodymium can achieve a +5 oxidation state at low temperatures, which was first observed in 2016 through matrix isolation and later confirmed in the bulk state in 2025. While the +3 state is the most stable and common, the +4 state also exists in some solid compounds.
Praseodymium makes up 9.1 parts per million in the Earth's crust, making it the sixth-most abundant rare-earth element. Its primary sources are minerals such as monazite and bastnäsite, which contain a mixture of rare-earth elements.