Osmium (Os). Diagram of the nuclear composition and electron configuration of an atom of osmium-192 (atomic number: 76), the most common isotope of th
Osmium (Os). Diagram of the nuclear composition and electron configuration of an atom of osmium-192 (atomic number: 76), the most common isotope of this element. The nucleus consists of 76 protons (red) and 116 neutrons (yellow). 76 electrons (white) bind to the nucleus, successively occupying available electron shells (rings). Osmium is a transition metal in group 8, period 6, and the d-block of the periodic table. It has a melting point of 3033 degrees Celsius. The trends across the transition metals are due to electrons filling an inner d-subshell (here, within the 5th ring), shielding the outer electrons from the increasing nuclear charge.
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Photo credit: © CARLOS CLARIVAN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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