Energy is required to remove two electrons from Ca to form Ca2+ and is required to add

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Energy is required to remove two electrons from Ca to form Ca2+ and is required to add two electrons to O to form O2-. Why, then, is CaO stable relative to the free elements?
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Chemistry The Central Science

ISBN: 978-0321696724

12th edition

Authors: Theodore Brown, Eugene LeMay, Bruce Bursten, Catherine Murphy, Patrick Woodward

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