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Neptunium is a chemical element with the symbol Np and atomic number 93. It is a radioactive actinide metal.
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Protactinium (formerly protoactinium) is a chemical element with the symbol Pa and atomic number 91. It is a dense, silvery-gray actinide metal which readily reacts with oxygen, water vapor and inorganic acids.I
Plutonium is a radioactive chemical element with the symbol Pu and atomic number 94. It is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized.
Mendelvium is a radioactive metal of the actinide series. It does not occur naturally and was first made in 1955 by bombarding einsteinium with helium ions.
Uranium is a chemical element with the symbol U and atomic number 92. It is a silvery-grey metal.
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3D models and images of the entire periodic table of elements
A collection containing 118 resources, curated by Library Lyna