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Iridium, atomic structure

Iridium, atomic structure

C013/1634

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Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Iridium (Ir). Diagram of the nuclear composition and electron configuration of an atom of iridium-193 (atomic number: 77), the most common isotope of this element. The nucleus consists of 77 protons (red) and 116 neutrons (blue). 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 electrons from the increasing nuclear charge.

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