0620/12 Chemistry May Jun 2024 Online test | Cambridge IGCSE MCQ

Potassium reacts with iodine to form an ionic compound.
$2K + {I_2} \to 2KI{\rm{ }}$
Which statements describe what happens when potassium reacts with iodine?
1- Each potassium atom loses two electrons.
2- Each potassium atom loses one electron.
3- Each iodine atom gains one electron.
4- Each iodine atom gains two electrons.