The color of an aqueous [Ni(H2O)6]2 solution is green, [Cu(H2O)6]2 solution is blue, [V(H2O)6]2 solution is violet, [Co(H2O)6]2 solution is red, and [Fe(H2O)6]3 solution is yellow. Which compound has the largest crystal field splitting

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.