Current Group Numbering System in the IUPAC Periodic Table of Elements
The International Union of Pure and Applied Chemistry (IUPAC) is an internationally recognized body in prescribing standards and systems in chemistry. It was formed in 1919 comprising of chemists from the industry and academe. Aside from the standardization of weights, measures, names and symbols, IUPAC has established a Group numbering system for the periodic table of elements. The IUPAC system uses the numbers 1-18 to designate the columns (groups) from left to right of the periodic table. The numbers are placed on top of the columns, as shown below.
Back in 1985, confusion was common on the Group numbering system using Roman numerals (I to VIII) and the letters A & B. Since the primary concern of IUPAC is “unambiguous communication”, they devised a system that is simple enough and “comprehensible to chemists at every level of expertise”. This means that the system is understandable to both beginning chemistry students and to post graduate chemistry researchers. They proposed the 1 to 18 Group numbering system which has now been widely accepted.
Below are snapshots of the periodic table, in color and grayscale version, designed and published by UP NISMED. It adopted the IUPAC 1 to 18 Group numbering system. Except for elements with multiple atomic masses, it followed the IUPAC-reported atomic masses. Moreover, this version already includes the two newly named elements, flerovium (114) and livermorium (116). A version of this publication is used in Grades 7 & 8 Science Learning Material on Matter authored by UP NISMED for the Department of Education in support of its K to 12 program.
You may download the posters (grayscale or colored) designed by UP NISMED solely for educational purposes, and NOT for profit gain. Another version may be downloaded which includes the electronegativity values. A poster-size version will be made available soon and may be purchased at UP NISMED STTC Building UP Diliman, QC.
Dr. Amelia E. Punzalan, Chemistry Group, UP NISMED
Note: Permission was granted by Dr. John D. Petersen (email@example.com), IUPAC Executive Director on the inclusion of their Periodic Table (PT) and the use of their PT as reference.
This material may be downloaded upon sending a request e-mail to firstname.lastname@example.org.