Memory Game for Metals, Nonmetals, and Metalloids Memory Game for Metals, Nonmetals, and Metalloids is a memory matching game (like Concentration) created by Bonnie Gradt. It has the following match cards: Conductor , Ductile, Physical property of metals , Physical property of Nonmetals , Luster , Conductivity , Brittle , Metals, Metalloids , Hardness , Non-metals 