Lutetium (Lu). Diagram of the nuclear composition and electron configuration of an atom of lutetium-175 (atomic number: 71), the most common isotope o
Lutetium (Lu). Diagram of the nuclear composition and electron configuration of an atom of lutetium-175 (atomic number: 71), the most common isotope of this element. The nucleus consists of 71 protons (red) and 104 neutrons (yellow). 71 electrons (white) bind to the nucleus, successively occupying available electron shells (rings). Lutetium is a lanthanide in group 3, period 6, and the d-block of the periodic table. It melts at 1652 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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