The__ an energy level is from the nucleus, the__ electrons it can hold

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.

it would be d. henry moseley

hope this !

and sorry if i'm late. have a good rest of your day! : d