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OpenStudy (anonymous):
Calcium oxide (CaO) forms when an atom of calcium loses two electrons, giving it a +2 charge and an atom of oxygen picks up two electrons, giving it a -2 charge. What is calcium oxide?
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OpenStudy (mathmate):
Quote from Wikipedia: "A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions."
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