 Okay, so let's see if you all can help me with this one. Which of the following is a non-metal? Can anybody tell me? This lithium? Is that a metal or a non-metal? Metal. Metal. Beryllium? Metal. Metal. Osmium? Metal. Metal. So iodine must be the non-metal, okay? So this is the... So if I couldn't figure that out, how would I be able to? What do I have to do? Look at the periodic table, and to the left of the staircase, right, is the metals, and where are the non-metals? To the right of the staircase, okay? And remember, on the staircase is the metalloids, okay? Sometimes you'll hear them called semi-metals, but metalloids is the more common term. Questions on that one?