Praseodymium, atomic structure

Praseodymium, atomic structure


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Praseodymium (Pr). Diagram of the nuclear composition and electron configuration of an atom of praseodymium-141 (atomic number: 59), the most common isotope of this element. The nucleus consists of 59 protons (red) and 82 neutrons (blue). Praseodymium is a lanthanide in period 6, and the f-block of the periodic table. It melts at 935 degrees Celsius. The trend across the lanthanides arises from the failure of electrons filling an inner f-subshell (here, within the 4th ring) to shield outer electrons from increasing nuclear charge.

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