What is the relationship between the atomic mass of an isotope and the Average Atomic Mass found on the Periodic Table? A.): The Average Atomic Mass of an element on the periodic table is always the same as the atomic mass of the most abundant isotope.
B.): The Average Atomic Mass of an element on the periodic table is the sum of the masses of all stable isotopes.
C.): The Average Atomic Mass of an element on the periodic table will be closest to the atomic mass of the most abundant isotope.

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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.

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a. formation of precipitation