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Europium, atomic structure

Europium, atomic structure

C013/1619

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Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Europium (Eu). Diagram of the nuclear composition and electron configuration of an atom of europium-153 (atomic number: 63), the most common isotope of this element. The nucleus consists of 63 protons (red) and 90 neutrons (blue). Europium is a lanthanide in period 6, and the f-block of the periodic table. It melts at 826 degrees Celsius. The trend across the lanthanide series 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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