Protactinium

Protactinium . Chemical element of the periodic table whose symbol is Pa and its atomic number is 91. Protactinium is a silvery metallic element that belongs to the group of actinides , which has an intense metallic luster. Protactinium is, from the …

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Praseodymium

Praseodymium . Praseodymium is a chemical element in the periodic table whose symbol is Pr and its atomic number is 59. Summary  [ hide ]  1 Features 1 History 2 Applications 3 Effects of Praseodymium on health 4 Environmental …

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