Which of the following is measured in Newtons?
Mass
Acceleration
Weight
Momentum

Mass is a newtons and it will not be weight because it’s mass

In any atom of any element, you will find protons and neutrons in the nucleus of any atom 

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.