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Which of the following isn't an elementary substance?

  1. Ozone
  2. Sulfur
  3. diamond
  4. quartz

I don't get what elementary substance means.

By seeing the options and the word elementary, I guess it means something like pure or obtained in its original form.

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From LATINTOS:

An elementary substance is a pure chemical substance that consists of atoms belonging to a single chemical element.

Now you should be able to solve your question.

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    $\begingroup$ ok so it's quartz. $\endgroup$ – Freddy Oct 8 '14 at 4:57

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