Potassium iodide is an ionic compound so option 1 is the correct Lewis dot structure which represents bonding in potassium Iodide.
The Lewis dot structure is a method of representing compounds in which the number of valence electrons on each element in the compound is shown using dots.
In this case, option 1 is the correct representation for potassium iodide using dot electron structure because potassium atom transfers its one valence electron to iodine forming the iodide ion having eight valence electrons as shown.
This gives iodine a negative charge and potassium a positive charge as shown in the structure in option 1.
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