Use le chatelier's principle to explain why the solubility of iodine in water increases as the concentrations of potassium iodide increases

The theory,depends on the various factors:-

According to the question, the molecule moves from high concentration to low concentration in different volumes and Pressure.

Then, increasing the concentration of the iodide ions creates a disturbance. According to theory, the system will react in a way that tends to reduce the disturbance.

The reaction shift in the forward direction, to make more triiodide ions and consume some of the added iodides with aqueous iodine. This causes more solid iodine to dissolve in the solution (increasing concentration).

Reaction: I₂(aq) + I⁻ (aq) ⇄ I₃⁻(aq).

For more information, refer to the link:-

link

"the periodic table is arranged in order of atomic number."