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Lanthanum, atomic structure

Lanthanum, atomic structure

C013/1613

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SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Lanthanum (La). Diagram of the nuclear composition and electron configuration of an atom of lanthanum-139 (atomic number: 57), the most common isotope of this element. The nucleus consists of 57 protons (red) and 82 neutrons (blue). Lanthanum is a lanthanide in period 6, and the f-block of the periodic table. It melts at 920 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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