nucleophilic substitution - What are the partial charges in an SN2 transition state?

What are the partial charges of on the atoms in a SN2 reaction?

The nucleophile is normally negatively charged and has a lone pair of electrons. This would make you think the transition state would have a negative charge on the nucleophile. The leaving group also is taking the electrons from the molecule with it. So what is the charge separation?

Here are conflicting images.

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