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Which list of formulas represents compounds, only?

(1) CO2, H2O, NH3 (3) H2, Ne, NaCl

(2) H2, N2, O2 (4) MgO, NaCl, O2

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A compound has to have at least two different elements in
(1) is the only list in which each of the three symbols representations show at least two different elements

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