Each O is bonded to Cl with a single bond, and each O has 3 lone pairs.
The Lewis structure for ClO4-1 is:
\[ \text{Cl} - \text{O} \text{ (single bond)} - \text{O} \text{ (3 lone pairs)} - \text{O} \text{ (3 lone pairs)} - \text{O} \text{ (3 lone pairs)} -
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