1. Write the balanced chemical equation:

Mg + F₂ → MgF₂

2. Interpret the coefficients:

The balanced equation tells us that one mole of magnesium (Mg) reacts with one mole of fluorine molecules (F₂) to produce one mole of magnesium fluoride (MgF₂).

Answer: One mole of fluorine molecules reacts with one mole of magnesium atoms.