A compound is made or two or more elements chemically bonded together.
Today in science we made a compound by combining Magnesium and Oxygen creating Magnesium Oxide. Magnesium Oxide is a white solid and in the process and while burning the Magnesium it became really bright like a small sun.
Mg + O2→MgO
Magnesium + Oxygen → Magnesium Oxide
Silver/grey solid + Clear colourless gas →white powdery solid