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Ca is 2+ and P is 3-

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Q: What is the oxidation number of Ca3P2?
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What is the formula for the ionic compound for Ca and P?

Ca2 + p3- have a lowest common multiple of 6(2X3 = 6). Therefore, the formula would require three Ca2+ ions and tow p3- ions to form the neutral compound Ca3P2. If one carefully examines the magnitude of the ion charges, those values indicate the number of atoms of the opposite ion needed. The formula produces a neutral (zero charge) compound and the least common multiple is used. the answer is Ca3P2


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