Each row in the periodic table corresponds to one energy level in an atom.

true or false ?

the correct answer is option d

explanation:

i was wrong its d because they dont use cm when calculating square roots

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.