Asked by Jennifer

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
Answered by DrBob222
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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