What's the sequence of polarization? with mV values

When the axon is polarized it is at -70 mV. then it has to reach a threshold of around -50mV so a sodium channel can let sodium in to depolarize to +30mV. then to repolarize to < -70mV, a potassium channel lets potassium out. finally to hyper polarize, the refractive period occurs with the Na+K+ pump taking the axon back to resting potential at -70mV.