A Periodic table The Periodic Table of the Elements.

In a column that is numbered 16 on most "extended form" tables or VI(A) on "narrow form" tables.

atomic number

The discovered elements all are not complete, so there are the extended ones. They currently go up to number 173, or unsepttrium

In the periodic table of the elements there are 7 periods and 18 groups. The rows are called periods and columns are called groups. You may be getting confused by the lanthanides and actinides. These groups of elements are found in two rows at the bottom and seem to not be a part of the table. However, if you find and extended version of the table you will see that, technically, these two rows belong in Periods 6 and 7.