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QUESTION

What is the simplest formula for chromium (II) and selenide?

##CrSe##

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?

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