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Holmium, atomic structure

Holmium, atomic structure

C013/1623

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Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Holmium (Ho). Diagram of the nuclear composition and electron configuration of an atom of holmium-165 (atomic number: 67), the most common isotope of this element. The nucleus consists of 67 protons (red) and 98 neutrons (blue). Holmium is a lanthanide in period 6, and the f-block of the periodic table. It melts at 1461 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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