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is bf polar or nonpolar
is brf polar or nonpolar or ionic
is b-f polar or nonpolar
is bf4- polar or nonpolar
bf2 polar or nonpolar
is a b-f bond polar or nonpolar
is brf polar or nonpolar
is bf3 polar or nonpolar
is bf2cl polar or nonpolar
if bf3 polar or nonpolar
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