difference between neurotransmitters and ions

1. Explain the difference between neurotransmitters and ions. What is their role in synaptic transmission?

2.Select ONE neurotransmitter (acetylcholine, dopamine, serotonin, norepinephrine, GABA, glutamate, endorphins) and investigate this chemical using at least one credible source other than the textbook (although you can additionally use our textbook as well). In your post, tell us: 1) what this neurotransmitter normally does for us, and 2) how irregularities in the production of this neurotransmitter (too much, too little, or other problems) can lead to a psychological or a physical disorder. Cite your sources as usual.