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Health and ScienceSciencePeriodic Table
Radioactive Rare Earth Elements
Actinide Series
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| Name: ActiniumSymbol: AcAtomic Weight: 227.0278Atomic Number: 89Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: Andre-Louis DebierneDiscovery Date: 1899 (France)Name Origin: Greek: akis, aktinos (ray). |
| Name: ThoriumSymbol: ThAtomic Weight: 232.0381Atomic Number: 90Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: Jons Jacob BerzeliusDiscovery Date: 1828 (Sweden)Name Origin: Named for Thor, Norse god of thunder. |
| Name: ProtactiniumSymbol: PaAtomic Weight: 231.03588Atomic Number: 91Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: Fredrich Soddy, John Cranston, Otto Hahn, Lise MeitnerDiscovery Date: 1917 (England/France)Name Origin: Greek: proto and actinium (parent of actinium); it forms actinium when it radioactively decays. |
| Name: UraniumSymbol: UAtomic Weight: 238.0289Atomic Number: 92Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: Martin KlaprothDiscovery Date: 1789 (Germany)Name Origin: Named for the planet Uranus. |
| Name: NeptuniumSymbol: NpAtomic Weight: 237.048Atomic Number: 93Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: E.M. McMillan, P.H. AbelsonDiscovery Date: 1940 (United States)Name Origin: Named for the planet Neptune. |
| Name: PlutoniumSymbol: PuAtomic Weight: 244.0642Atomic Number: 94Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: G.T.Seaborg, J.W.Kennedy, E.M.McMillan, A.C.WohlDiscovery Date: 1940 (United States)Name Origin: Named for the planet Pluto. |
| Name: AmericiumSymbol: AmAtomic Weight: 243.0614Atomic Number: 95Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: G.T.Seaborg, R.A.James, L.O.Morgan, A.GhiorsoDiscovery Date: 1945 (United States)Name Origin: Named for the American continent, by analogy with europium. |
| Name: CuriumSymbol: CmAtomic Weight: 247.0703Atomic Number: 96Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: G.T.Seaborg, R.A.James, A.GhiorsoDiscovery Date: 1944 (United States)Name Origin: Named in honor of Pierre and Marie Curie. |
| Name: BerkeliumSymbol: BkAtomic Weight: 247.0703Atomic Number: 97Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: G.T.Seaborg, S.G.Tompson, A.GhiorsoDiscovery Date: 1949 (United States)Name Origin: Named after Berkeley, California the city of its discovery. |
| Name: CaliforniumSymbol: CfAtomic Weight: 251.0796Atomic Number: 98Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: G.T.Seaborg, S.G.Tompson, A.Ghiorso, K.Street Jr.Discovery Date: 1950 (United States)Name Origin: Named after the state and University of California. |
| Name: EinsteiniumSymbol: EsAtomic Weight: 252.083Atomic Number: 99Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: Argonne, Los Alamos, U of CalifDiscovery Date: 1952 (United States)Name Origin: Named in honor of the scientist Albert Einstein. |
| Name: FermiumSymbol: FmAtomic Weight: 257.0951Atomic Number: 100Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: Argonne, Los Alamos, U of CalifDiscovery Date: 1953 (United States)Name Origin: Named in honor of the scientist Enrico Fermi. |
| Name: MendeleviumSymbol: MdAtomic Weight: 258.1Atomic Number: 101Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: G.T.Seaborg, S.G.Tompson, A.Ghiorso, K.Street Jr.Discovery Date: 1955 (United States)Name Origin: Named in honor of the scientist Dmitri Ivanovitch Mendeleyev, who devised the periodic table. |
| Name: NobeliumSymbol: NoAtomic Weight: 259.1009Atomic Number: 102Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: Nobel Institute for PhysicsDiscovery Date: 1957 (Sweden)Name Origin: Named in honor of Alfred Nobel, who invented dynamite and founded Nobel prize. |
| Name: LawrenciumSymbol: LrAtomic Weight: 262.11Atomic Number: 103Element Classification: Radioactive Rare Earth Element (Actinide Series)Discovered By: A.Ghiorso, T.Sikkeland, A.E.Larsh, R.M.LatimerDiscovery Date: 1961 (United States)Name Origin: Named in honor of Ernest O. Lawrence, inventor of the cyclotron. |
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