Now these guys, these columns are known as groups. So group one, group two, group three, group four, all the way up to group 18, while these rows are known as periods. So period one, period two, period 3456, all the way up to period seven. Now these guys, or this table is divided into three main divisions known as metals, nonmetals and metalloids. Now the white squares or the white elements are known as metals. And they're found from left all the way up to this section here.