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Drats, I had the entire name, just wasn't sure how the background fit in. If you had just said ion specifically, I would've been able to answer it right away.
@diobuceulb, is the way the background plays into the answer a hint using what a complex plane is used for in chemistry and referring to a paper on the answer?
@Bass I have had that since yesterday, sorry for not posting, but can't figure #4 out on my own. See my answer for what I have had since yesterday but was trying to complete before posting.