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There is a chromium selenide, a simple binary salt

Chemistry

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There is a chromium selenide, a simple binary salt. How do I know that selenium has a ##-II## oxidation state? Consult ; there should be one beside you now. Selenium (like oxygen) is a chalcogen, and lies in the same Group as oxygen; it should, therefore, exhibit similar oxidation states.

What is the formula for chromous sulfide?