Europium(II) oxide is a semiconductor with a band gap of 108 kJ/mol. Below 69 K, it is also ferromag

Europium(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. (a) How many electrons are present on each europium ion in EuO? (In lanthanide ions the 4 orbitals are lower in energy than the 6 s orbitals.) (b) All the electrons are unpaired in EuO. Predict the spin-only magnetic moment of EuO, using the formula in Problem 20.132 .

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