A negatively charged ion has what

The negative charge of an ion is equal and opposite to charged proton(s) considered positive by convention. The net charge of an ion is non-zero due to its total number of electrons being unequal to its total number of protons.

Explanation:

More Eletrons than Protons

Explanation:

If the charge is neutral there are the same amout of protons and eletrons, but when it is negative, it means that there are more eletrons (because eletrons have negative charge by nature)

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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