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The question here deals with visualizing what figure represents a pure element. A pure element contains only one type of atom in it, while other compounds contain more than one type of atom. Important to remember is that an element does not need to contain only one atom per molecule. In fact, some elements, such as oxygen, can only exist in a diatomic state, ie O2. This comes into play when choosing the answer for this question. The answer is i, as i is the only picture that shows only one type of atom. i is a pure element.