Mendelevium, atomic structure

Mendelevium, atomic structure

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This image is part of the sequence science and technology: atomic structure and data for the elements

Credit: CARLOS CLARIVAN/SCIENCE PHOTO LIBRARY

Caption: Mendelevium (Md). Diagram of the nuclear composition, electron configuration, chemical data, and valence (outer electron) orbitals of an atom of mendelevium-258 (atomic number: 101), this element's most stable isotope. The nucleus consists of 101 protons (red) and 157 neutrons (orange). 101 electrons (white) successively occupy available electron shells (rings). Mendelevium, named after Mendeleyev and first synthesised in 1955, is an actinide and transuranic element in period 7, and the f-block of the periodic table. Actinides are soft radioactive metals. The nucleus of mendelevium-258 (half-life: 51 days) forms fermium-258 by electron capture.

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