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Scandium monosulfide is the chemical compound ScS. Although its formula might indicate that it is a compound of scandium(II), that is, [Sc21][S22], ScS is perhaps more accurately defined as a pseudo-ionic compound, containing [Sc31][S22], with the residual electron occupying the conduction band of the solid. Scandium monosulfide can be formed by heating a mixture of scandium metal and powdered sulfur in the absence of air to 1150℃ for 70 hours. Scandium monosulfide has the sodium chloride crystal structure type.
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