Chlorine has many
different isotopes, but almost all chlorine
atoms are either chlorine-35 or chlorine-37. a
chlorine-36 isotope also exists. suppose your
job is to produce a brochure that compares
and contrasts these isotopes. list three
questions you would ask and answer in your
brochure.
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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.

a polar bond is formed when electrons are shared unevenly between atoms

can you attach the