Palladium (Pd). Diagram of the nuclear composition, electron configuration, and valence orbitals of an atom of palladium-106 (atomic number: 46), the
Palladium (Pd). Diagram of the nuclear composition, electron configuration, and valence orbitals of an atom of palladium-106 (atomic number: 46), the most common isotope of this element. The nucleus consists of 46 protons (blue) and 60 neutrons (red). Palladium is a transition metal in group 10, period 5, and the d-block of the periodic table. It has a melting point of 1555 degrees Celsius. The transition metal trends are due to electrons filling an inner d-subshell (here, within the 4th 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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