2. Which of the following elements lose electrons when react with each other: potassium and iodine, sulfur and sodium, magnesium and oxygen, fluorine and lithium.

In these pairs, the elements that lose electrons are metals. When a metal reacts with a non-metal, the metal usually gives away electrons and becomes a positive ion.

• potassium and iodine: potassium loses electrons
• sulfur and sodium: sodium loses electrons
• magnesium and oxygen: magnesium loses electrons
• fluorine and lithium: lithium loses electrons

So the answer is: potassium, sodium, magnesium, and lithium.

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