Cerium
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Cerium is a chemical element; it has symbol Ce and atomic number 58, and is a soft, ductile, and silvery-white metal that tarnishes when exposed to air. Cerium is the second element in the lanthanide
Cerium 2
Phase diagram of cerium
Ceric ammonium nitrate
A white LED in operation: the diode produces monochromatic blue light but the Ce:YAG phosphor converts some of it into yellow light; the combination is perceived as white by the human eye.
Praseodymium
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Praseodymium is a chemical element; it has symbol Pr and atomic number 59. It is the third member of the lanthanide series and is considered one of the rare-earth metals. It is a soft, silvery, mallea
Cerium
…its unique ability to be oxidized to the +4 state in aqueous solution. It is the most common of the lanthanides, followed by neodymium, lanthanum, and praseodymium. Its estimated abundance in the Earth's crust is 68 ppm. Cerium was the first of the lanthanides to be discovered, in Bastnäs, Sweden. It was discovered…
Praseodymium
Praseodymium(III) hydroxide
Carl Auer von Welsbach (1858–1929), discoverer of praseodymium in 1885.