QUESTION: Which of the following elements is a metal that belongs to a main group or representative group? A. magnesium, B. zinc, C. sulfur, D. uranium SCRIPT: Which of the following elements is a metal that belongs to a main group or representative group? A. magnesium, B. zinc, C. sulfur, D. uranium PAUSE To answer this question, let’s refer to a periodic table. CONTINUED ON NEXT SLIDE

Inner transition elements Main or representative groups: columns 1, 2, and 13 through 18. (Groups IA, IIA, IIIA, IVA, VA, VIA, VIIA, and VIIIA) Transition elements The main or representative groups are highlighted in the periodic table shown here. These are columns 1, 2 and 13 through 18. The metallic elements are shown here highlighted in red. The nonmetallic elements are highlighted in blue. And the metalloids are highlighted in yellow. Here’s magnesium CLICK It’s a metal, … and it belongs to group IIA. Therefore it belongs to a representative or main group. This is the correct answer. Let’s look at where the other choices are… Here’s zinc. It belongs group 2B…It is a transition element. Here’s sulfur… CLICK It belongs to group six A. It’s a representative element, but it’s a nonmetal. Finally, here’s uranium. It’s in what is known as the actinide series. It’s an inner transition element. Inner transition elements

QUESTION: Which of the following elements is a metal that belongs to a main group or representative group? A. magnesium, B. zinc, C. sulfur, D. uranium The correct answer is magnesium. CLICK PAUSE END RECORDING

Video ID: 1-6-4 © 2008, Project VALUE (Video Assessment Library for Undergraduate Education), Department of Physical Sciences Nicholls State University Author: Glenn V. Lo Narrator: Funded by Louisiana Board of Regents Contract No. LA-DL-SELECT-13-07/08