The given is:
Let a small circle represent an atom of one type of element and a small square represent an atom of a second type of element. Select what is shown on each of the pictures:
(a) a pure substance (a compound) composed of the two elements (in a one-to-one ratio)
(b) a homogeneous mixture composed of the two elements
(c) a heterogeneous mixture composed of the two elements
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What scientific concept do you need to know in order to solve this problem?
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