In this lecture, we're going to talk about two more groups or families found on our Fiana table known as the calculus, or group 16, six A, and the noble gas group, or group 18 or eight A. Now, let's begin with our calculations. Now, there are five main calculations. Oxygen, sulfur and selenium are all nonmetals, while our metalloids are polonium and talorium. Now notice, unlike group five A and four A, which both have metals, group six A, or the calcigens, don't have any metals. Now, let's begin with oxygen.