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in Chemical Bonding and Molecular Structure by (49.4k points)

Which of the following has maximum dipole moment: Na+, K+, Li+ and Cs+.

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Dipole moment is directly proportional to electronegativity. Electronegativity decreases with increasing atomic size. Thus, the ion having smallest size has maximum electronegativity and thus, maximum dipole moment. Also, atomic size increases down the group. Therefore, in the above ions, Li+ has smallest size. Hence, it has maximum dipole moment.

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