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Its Rb because its the only metal listed and ionic compounds are formed as a result of a metal bonding with a nonmetal which is the chlorine.

Rb because if you the subtract the electronegativities:

(Cl) 3.2 - (Rb) .8 = 2.4 which is more than 2.0 making it ionic.

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Samar Elsayed

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Q: The compound XCI is classified as ionic of X represents the element?
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