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chemistry

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an unknown element, X, reacts with chlorine to form an ionic compound XC12, if the X ion has 18 electrons, the element X is what?

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    XCl2 means element X is in group II (or 2 depending upon the system your instructor is using). The element with 18 electrons is Ar; therefore, the element X must have 20 electrons and I would think that would be ......?

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