An ion is has 5 proton, 7 nuetron, 3+ of what

Normally an atom would have the same number of proton and electron in order to be neutral. But an ion has a charge either positive or negative. 3+ meaning that the ion is positive and have 3 less electron compared to the proton. So this ion has 5 proton and 2 electron.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

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