<u>Answer:</u> The chemical formula is ![XSO_3](https://tex.z-dn.net/?f=XSO_3)
<u>Explanation:</u>
Ionization energy is defined as the amount of energy that is required to remove an electron from a chemical species.
The ionization energy equation for the given values follow:
![X(g)\rightarrow X^+(g)+e^-;E_I=590kJ/mol](https://tex.z-dn.net/?f=X%28g%29%5Crightarrow%20X%5E%2B%28g%29%2Be%5E-%3BE_I%3D590kJ%2Fmol)
![X^+(g)\rightarrow X^{2+}(g)+e^-;E_I=1145kJ/mol](https://tex.z-dn.net/?f=X%5E%2B%28g%29%5Crightarrow%20X%5E%7B2%2B%7D%28g%29%2Be%5E-%3BE_I%3D1145kJ%2Fmol)
![X^{2+}(g)\rightarrow X^{3+}(g)+e^-;E_I=4912kJ/mol](https://tex.z-dn.net/?f=X%5E%7B2%2B%7D%28g%29%5Crightarrow%20X%5E%7B3%2B%7D%28g%29%2Be%5E-%3BE_I%3D4912kJ%2Fmol)
From the values of ionization energy above, it can be seen that the ionization energy increases as every succeeding electron is removed.
Second ionization energy is a little higher than the first one but there is a huge amount of difference between the third and second ionization energy.
This implies that the ion formed during second ionization energy has a stable configuration and it requires a humongous amount of heat to release the third electron.
Hence, the ion formed will be ![X^{2+}](https://tex.z-dn.net/?f=X%5E%7B2%2B%7D)
Sulfite ion is a polyatomic ion having a chemical formula of ![SO_3^{2-}](https://tex.z-dn.net/?f=SO_3%5E%7B2-%7D)
An ionic compound is formed between the two ions and the chemical compound formed between the two will have a formula of ![XSO_3](https://tex.z-dn.net/?f=XSO_3)
Hence, the chemical formula is ![XSO_3](https://tex.z-dn.net/?f=XSO_3)