16. Students in a chemistry course were asked the following question on a unit exam: "Draw a dia-
gram representing an element using circles as atoms."
a. The following diagrams represent two typical answers given by students. Which drawing is
the best representation of an element? Explain.
b. Imagine that the atom in Drawing B had been removed by physical separation from one
of the substances in Model 1. What substances could have been the source of the atom in
Drawing B?

If the atom in Drawing B had been removed by physical separation from one of the substances in Model 1, the substance that could have been the source of the atom in Drawing B is an element.

What is the source of the atom?

An atom is the smallest part of a substance that can take part in a chemical reaction. We know that elements are composed of atoms. The atoms of an element are discretely arranged. Thus, in an element, there are so many atoms of the substance.

In the image that has been shown in the question, the source of the atom as it has been show is an element. Thus, if the atom in Drawing B had been removed by physical separation from one of the substances in Model 1, the substance that could have been the source of the atom in Drawing B is an element.

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