Task: Question Answering
Input (English): Use The Periodic Table of the Elements and the information below to answer the question. Magnesium metal (Mg) is grayish-white in color and reacts actively with water. Fluorine (F2) is a greenish-yellow gas at room temperature and is a member of the halogen family. These two elements react to produce magnesium fluoride (MgF2), a chemical commonly used in making windows and lenses. How does adding heat energy affect magnesium fluoride (MgF2) molecules?  
 (A) The motion of the molecules stops. (B) The motion of the molecules increases. (C) The motion of the molecules decreases. (D) The motion of the molecules is at a constant rate.
Output (English): B