Why is it permissible to use a wet bottle when first obtaining your kmno4 solution?

For the answer to the question above, well presumably because the exact concentration of the composition KMnO4 solution doesn't matter. If the concentration of the KMnO4 solution is important (usually in titrations etc.) then it is not allowed to use a wet bottle. The water in the bottle will dilute the KMnO4 solution and change the concentration of the said compound.

if you know how to try an atom, a positive atom is an atom that has one less electron then proton and a negative atom is an atom that has one more electron than proton. For the isotopes you draw the same atom but withdifferent numbers of neutrons