Select the correct answer from the drop down menu. 1.)Protons or electrons
2.)Periods or groups
3.)Periods or groups

Carbon based or cells?

Each calcium ion has a charge of +2, which can also be written as ca2+. if those ions move out of the neuron and no other ions are moving, the neuron would lose the positive charge associated with those ions and become more negatively charged.

The correct answer should be a.