Both of these are important when dealing with Hydrogen Fuel Cells, because in order to understand the electrical process, we must first understand what is an electron, what is a proton, and what are their properties. We must also understand ions, because they show up often when we deal with electrolysis.
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Also, an ion is when an element does not have an equal amount of protons and electrons, thus giving it a positive or negative charge. This is different than an isotope, which has a greater atomic mass than it normally would, due to the gaining or loss of a nuetron or proton.
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