<p>Something is polar if the difference in electronegativity is .5 and above, correct?</p>
<p>I thought the rule was less than 1.7. My chem teacher says that a better rule with fewer exceptions is it's a nonmetal with another nonmetal. As long as it's not symmetrical it's polar.</p>
<p>Thanks...
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<p>I agree with mikeyc. Although the AP test is evil in nature, it rarely tries to trick you.</p>