;) asked in Science & MathematicsChemistry · 1 decade ago

How do you find Chemical Formula?

One Example on my HW are what is the formula of calcium and phosphorus, of aluminum and oxygen or of sodium and Oxygen.

Thanks!

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  • 1 decade ago
    Favorite Answer

    You begin by setting up the two elements like this: Al (aluminum) O (oxygen)......then you find the charges of the two (3+ for Al and 2- for O) and write them to the top right of the elements so you have Al^3+ and O^2-.....if the charges have the same NUMBER--not positive or negative--then they cancel out and you have your chemical formula (such as NaO - Na has a 2+ charge and O has a 2- charge). However, in the case of Al and O, we have 3+ and 2-, so we criss cross the charges down and drop the signs, making the chemical formula Al2O3 (2 and 3 are subscripts)

    Source(s): AP Chemistry (I got an A!)
  • 4 years ago

    How To Find Chemical Formula

  • Anonymous
    6 years ago
  • Anonymous
    5 years ago

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