Praseodymium

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  Cerium

  Cerium /ˈsɪəriəm/ is a chemical element with the symbol Ce and atomic number 58. It is a soft, silvery, ductile metal which easily oxidizes in air. Cerium was named after the dwarf planet Ceres (itself named for the Roman goddess of agriculture). Cerium is the most abundant of the rare earth...
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  Ytterbium

  Ytterbium ( /ɨˈtɜrbiəm/ i-TUR-bee-əm) is a chemical element with the symbol Yb and atomic number 70. It is the the fourteenth and penultimate element in the lanthanide series, or last element in the f-block, which is the basis of the relative stability of the +2 oxidation state. However, like the...
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  Erbium

  Erbium ( /ˈɜrbiəm/) is a chemical element in the lanthanide series, with the symbol Er and atomic number 68. A silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements on Earth. As such, it is a rare earth element which is...
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  Promethium

  Promethium ( /prɵˈmiːθiəm/ pro-MEE-thee-əm), originally prometheum, is a chemical element with the symbol Pm and atomic number 61. It is notable for being the only element besides technetium all of whose isotopes are radioactive but which is followed in the periodic table by chemical elements with...
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  Terbium

  Terbium ( /ˈtɜrbiəm/ TUR-bee-əm) is a chemical element with the symbol Tb and atomic number 65. It is a silvery-white rare earth metal that is malleable, ductile and soft enough to be cut with a knife. Terbium is never found in nature as a free element, but it is contained in many minerals,...
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  Europium

  Europium ( /jʊˈroʊpiəm/ ew-ROH-pee-əm) is a chemical element with the symbol Eu and atomic number 63. It is named after the continent of Europe. It is a moderately hard silvery metal which readily oxidizes in air and water. Being a typical member of the lanthanide series, europium usually assumes...