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It is not a formula, it is the atomic number and the mass number.


The atomic number is the number of protons.
The mass number is the weight of a single atom of the element and also the number of protons and neutrons.
The number of neutrons can be found by taking the proton number from the atomic number.

If you are talking about moles and titration then change the question and I will give a more suitable answer.

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