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Samarsky-Bykhovets, Russian mine official","group":null,"period":6,"block":"f-block","atomicWeight":150.36,"density":7.52,"meltingPoint":1345,"boilingPoint":2067,"origin":"primordial","phase":"solid"},{"atomicNumber":63,"symbol":"Eu","name":"Europium","originOfName":"Europe","group":null,"period":6,"block":"f-block","atomicWeight":151.96,"density":5.244,"meltingPoint":1099,"boilingPoint":1802,"origin":"primordial","phase":"solid"},{"atomicNumber":64,"symbol":"Gd","name":"Gadolinium","originOfName":"Gadolinite, a mineral named after Johan Gadolin, Finnish chemist, physicist and mineralogist","group":null,"period":6,"block":"f-block","atomicWeight":157.25,"density":7.9,"meltingPoint":1585,"boilingPoint":3546,"origin":"primordial","phase":"solid"},{"atomicNumber":65,"symbol":"Tb","name":"Terbium","originOfName":"Ytterby, Sweden, where it was found; see also yttrium, erbium, 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'water-silver'","group":12,"period":6,"block":"d-block","atomicWeight":200.59,"density":13.534,"meltingPoint":234.43,"boilingPoint":629.88,"origin":"primordial","phase":"liquid"},{"atomicNumber":81,"symbol":"Tl","name":"Thallium","originOfName":"Greek thallós, 'green shoot or twig'","group":13,"period":6,"block":"p-block","atomicWeight":204.38,"density":11.85,"meltingPoint":577,"boilingPoint":1746,"origin":"primordial","phase":"solid"},{"atomicNumber":82,"symbol":"Pb","name":"Lead","originOfName":"English word, from Proto-Celtic *ɸloudom, from a root meaning 'flow'\r\n ·  Symbol Pb is derived from Latin plumbum","group":14,"period":6,"block":"p-block","atomicWeight":207.2,"density":11.34,"meltingPoint":600.61,"boilingPoint":2022,"origin":"primordial","phase":"solid"},{"atomicNumber":83,"symbol":"Bi","name":"Bismuth","originOfName":"German Wismut, from weiß Masse 'white mass', unless from 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