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Which statements about resonance are true?
I. Resonance hybrids do occur because a compound changes back and forth between two or more resonance structures.
II. Resonance structures do differ in the arrangement of electrons but not in the arrangement of atoms.
III. Resonance hybrids contain delocalized electrons.
IV. Resonance structures for a given compound always contribute equally to the resonance hybrid.
V. Resonance structures occur when there are two or more valid Lewis structures for a given compound.
VI. Resonance hybrids are a composite of resonance structures.
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