An atom has 5 valence electrons in its 2nd energy level. Will the atom react and why? A. Yes because it has an incomplete outer shell

B. No because it has an incomplete outer shell

C. Yes because it has a complete outer shell

D. No, because it has an complete outer shell

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.

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?