chemistry

Which of the following ions possess a dipole moment?

(a) ClF2+
has a dipole moment
has no dipole moment
cannot be determined
(b) ClF2−
has a dipole moment
has no dipole moment
cannot be determined
(c) IF4+
has a dipole moment
has no dipole moment
cannot be determined
(d) IF4−
has a dipole moment
has no dipole moment
cannot be determined

Can someone explain how to know what has a dipole moment after drawing the structure? I understand that the more electronegative the atom is where the dipole points to but what effect does the ionic compound charges have on whether it has a dipole moment? Thanks

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