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Samarium monochalcogenides
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<p>Samarium monochalcogenides are chemical compounds with the composition SmX, where Sm stands for the <a href="/facts/Lanthanide/rt3XIRCl">lanthanide</a> element <a href="/facts/Samarium/09K3kl93">samarium</a> and X denotes any one of three <a href="/facts/Chalcogen/nXLGmnqL">chalcogen</a> elements, <a href="/facts/Sulfur/IK0amTfM">sulfur</a>, <a href="/facts/Selenium/k975NApC">selenium</a> or <a href="/facts/Tellurium/v7QvfIvS">tellurium</a>, resulting in the compounds SmS, SmSe or SmTe. In these compounds, samarium formally exhibits <a href="/facts/Oxidation_state/W53W6s6V">oxidation state</a> +2, whereas it usually assumes the +3 state, resulting in chalcogenides with the chemical formula Sm2X3. </p>