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What single condition is required to insure that a molecule will be polar covalent?
(A) a bond between atoms that are of widely different atomic weights.
(B) a bond between atoms that are different in electronegativity.
(C) a bond between like atoms.
(D) none of the choices.

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Answer:

(B) A bond between atoms that are different in electronegativity.

Explanation:

If the atoms have different electronegativities, one atom will have greater electron density than the other. The bond will be polar.

(A) is wrong. Atomic mass does not affect electronegativity.

(C) is wrong. If the two atoms are alike, the bond is pure covalent.

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