A sample of Ar gas has a volume of 475 mL, has a pressure of 976 mm Hg, and is at a temperature of 23.5 °C. Calculate the amount (in moles) of Ar in the gas sample. __mol

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.

Well you can immediately rule out a and d because if a metal were to lose or gain protons, then it would become a different element all together. the answer here is b because the positive symbol with a number refers to how many electrons the metal can give away to become stable.