13. Liquids, Solids & Intermolecular Forces
Crystalline Solids
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Problem 139
Textbook Question
Textbook QuestionEuropium(II) oxide is a semiconductor with a band gap of 108 kJ/mol. Below 69 K, it is also ferromagnetic, meaning all the unpaired electrons on europium are aligned in the same direction. How many f electrons are present on each europium ion in EuO? (In lanthanide ions the 4f orbitals are lower in energy than the 6s orbitals.)
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