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The f-block columns between groups 2 and 3 are not numbered. Which of the following statements best describes the lements in Group 8A 18 of the periodic table. Pin On Periodic Table Unit Element Group. . A group on the periodic table is best described as a Answers. The f-block columns between groups 3 and 4 are not numbered. Which sequence of elements is aranged in order of decreasing atomie radi. The rows are called the periods while the columns are called the groups. The number of principal energy levels increases and the number of valence electrons increases. As elements in a group of the periodic table are considered in order from top to bottom the metallic character of each successive element generally. There are two rows of elements found below the main body of the periodic table. A row of elements. Which phrase best describes a group or family in the periodic table. With a standard ...