The electrons in the outermost energy level are responsible for the atoms . These electrons are called the electrons. There can never be more than of these electrons.

petroleum? coal maybe?

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explanation:

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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.

the answers would be

the first one and the second one