Question

Which of the following lists includes only molecules?

Fe8 CO Mg

He H20 NO2

CO Fe O2

NaCl N2 H20

Answer 1

The only list containing molecules is list #4

NaCl, N2, and H2O are all made up of more than one element, making them molecules. The other lists contain an element. Mg, He, and Fe are elements, not molecules.

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