Thulium (Tm). Diagram of the nuclear composition,electron configuration,chemical data,and valence orbitals of an atom of thulium-169 (atomic number: 69),the most common isotope of this element. The nucleus consists of 69 protons (red) and 100 neutrons (orange). 69 electrons (white) successively occupy available electron shells (rings). Thulium is a lanthanide in period 6,and the f-block of the periodic table. It melts at 1545 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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