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carl creates the model of a diamond shown below. his model shows atoms of carbon in a crystalline structure. what can carl determine about diamonds using his model?

group of answer choices

a diamond is a mixture because it is made of compounds.

a diamond is an impure substance because it made of mixtures.

a diamond is a pure substance because it is made of one element.

a diamond is a mixture because it is made of elements.

(here is the pic)