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Which of the following best characterizes a covalent bond?
A. occurs when elements have opposite electrical charge
B. occurs when elements have very different electronegativity values
C. occurs when atoms have similar tendencies to attract electrons and share electrons between them
D. occurs when atoms are of the same size

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A covalent bond C. occurs when atoms have similar tendencies to attract electrons and share electrons between them.
A refers to ionic, not covalent bonds. D is incorrect because the size of the atoms is irrelevant. Electronegativity values are also not that important, so B is also not correct.