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Choose the correct answer. In the following symbol 4 Al2CO3:
a 3 is the coefficient.
b 4 is a subscript.
c 4 is the coefficient, 2 and 3 are the subscripts.

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Kaiusviz
C is the answer. Coefficient is the number before the compound, so it is 4. Subscripts are small numbers below an element, so are 2 and 3.

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