Iridium (Ir). Diagram of the nuclear composition, electron configuration, chemical data, and valence orbitals of an atom of iridium-192 (atomic number
Iridium (Ir). Diagram of the nuclear composition, electron configuration, chemical data, and valence orbitals of an atom of iridium-192 (atomic number: 77), an isotope of this element. The nucleus consists of 77 protons (red) and 115 neutrons (orange). 77 electrons (white) successively occupy available electron shells (rings). Iridium is a transition metal in group 9, period 6, and the d-block of the periodic table. It has a melting point of 2466 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 (valence) electrons from the increasing nuclear charge.
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Photo credit: © CARLOS CLARIVAN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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