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I'm confused as to what full ionization mean? I have the mean molecular weight of electrons and ions and I have to calculate the ideal gas pressure for a star. Do I have to add them up as usual or do I use only the mean molecular weight of ions?

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  • $\begingroup$ The proton mass is about 2000 times the electron mass, so it might be reasonable to neglect the electrons entirely. Depends on the accuracy of your calculation. $\endgroup$ – Kyle Kanos Apr 13 '15 at 17:50
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Full ionization means that the electrons are no longer bound to the nuclei: the electrons and the nuclei behave as independent particles. I think this means you can treat them as a gas - the same way that you would treat a mixture of gases.

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