Question
How does electronegativity help us decide if a compound that forms from two elements will be an ionic compound, or a molecular compound? *
Answers
Take the difference of the electronegativity between the two elements. The 50% ionic/covalent mark is a difference of about 1.7 (books differ and I see 1.8 or 1.9). Over 1.7 we call it ionic; below 1.7 we call it covalent. That is, a difference of 1.5 actually is about 60% covalent/40% ionic but you get the idea.
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