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-- card: 40611 from stack: in -- bmap block id: 0 -- flags: 0000 -- background id: 14320 -- name: Md -- part contents for background part 14 ----- text ----- Md -- part contents for background part 22 ----- text ----- Mendelevium -- part contents for background part 15 ----- text ----- 101 -- part contents for background part 17 ----- text ----- (258) -- part contents for background part 21 ----- text ----- +2,+3 -- part contents for background part 16 ----- text ----- (after Dmitri Mendeleev) Identified by Ghiorso, Harvey, Choppin, Thompson and Seaborg in 1955 by bombarding Es-258 with helium ions in the Berkeley 60-inch cyclotron. -- part contents for background part 23 ----- text ----- rare earth metal, radioactive, 4 isotopes -- part contents for background part 26 ----- text ----- Electron Configuration: 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 6f 7s 2 2 6 2 6 10 2 6 10 14 2 6 10 13 2 6 2