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March 25, 2017

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Which of the following pairs of elements are likely to form an ionic compound?

lithium and chlorine
sodium and potassium
phosphorus and chlorine
sodium and nitrogen
argon and potassium

  • Chem - ,

    a is the only answer. How do you know? Look up the electronegativities and subtract them. The difference in EN must be about 1.8 or so to be more ionic than covalent.

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