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How is neuronal repolarization attained

In the chemical terms how is neuronal repolarization attained?

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Repolarization is return of membrane potential from action potential (+35 mV) to the resting potential (-70 mV).
When membrane reaches its action potential voltage-gated sodium channels close and voltage-gated way potassium channels open. So sodium stops entering into the cell and potassium starts to exit. Thus the repolarization is because of exiting of potassium cations from cell.

The repolarization causes the potential differentiation temporarily to raise under –70 mV, below the resting potential, a phenomenon named as hyperpolarization.

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