So its the beginning of chemistry and I don't know how to make formulas. BUT its very important I learn now otherwise I will have a very hard year...(adsbygoogle = window.adsbygoogle || []).push({});

For ex:

It says, "Fill in the correct formulas for the given anion and cation."

SO^{2-}_{4}and Al^{3+}(how do i combine those two to make a formula)

Another ex:

Al^{3+}and Cr_{2}O^{2-}_{7}

PLEASE EXPLAIN HOW TO DO THESE.

Thanks so much for any help:)!

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# How do you find out formulas?

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