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21 July, 07:21

Which of these chemical formulas represents both an element and a molecule?

NaCl

O2

He

SO2

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Answers (1)
  1. 21 July, 08:33
    0
    O2.

    Because it is only made up of one type of element it is an element. Howevern there is more than one oxygen atom because oxygen cannot exist as a single atom, therefore making it a molecule as well.
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