Which statement describes a chemical reaction? · atoms in the products are rearranged to form new substances · atoms in the reactants are rearranged to form new substances · atoms in the products change into new atoms to form new substances · atoms in the reactants change into new atoms to form new substances

indium, and thallium have three electrons i think

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.