How are the codes (chemical formulas) for elements different than those for compounds?

Two or more atoms held together with bonds make up a molecule. Pure substances are made of only one type of atom. At least two types of atoms are required to make a compound. Mixtures can be made of two elements, two compounds, or an element & a compound.

i think that the best answer would be c.

tell me if im wrong : )

d) center of the mid-ocean ridge

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