Lanthanum (La). Diagram of the nuclear composition,electron configuration,chemical data,and valence orbitals 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 (orange). 57 electrons (white) successively occupy available electron shells (rings). 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 (valence) electrons from increasing nuclear charge | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Clarivan, Carlos |
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