Construct the Frost circles for the cyclopentadienyl anion and cyclopentadienyl cation. What is their difference? 

The Frost circles show that the cyclopentadienyl cation is antiaromatic, while the cyclopentadienyl anion is aromatic.

The Frost circles show that the cyclopentadienyl cation is antiaromatic, while the cyclopentadienyl anion is aromatic.

The Frost circles show that the cyclopentadienyl cation is aromatic, while the cyclopentadienyl anion is antiaromatic.

The Frost circles show that the cyclopentadienyl cation is aromatic, while the cyclopentadienyl anion is antiaromatic.