What is the maximum amount of electrons that can be in the third energy level of an atom? (question continued in comments)

18 electrons

Explanation:

If you search on Google you get the same answer, so the question gives you your answer.

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.