APA citation style: Historic American Buildings Survey, C. & Benison, G. (1933) Oakland Plantation, Mount Pleasant, Charleston County, SC. Documentation Compiled After. [Pdf] Retrieved from the Library of Congress, https://www.loc.gov/item/sc0292/.
There are 18 groups (columns) in the periodic table. Group 1 (also known as the alkali metals) is the column on the far left of the table. Elements in the same group have similar, but not identical characteristics. This is because they all have the same number of electrons in their outermost shell.
The Periodic Table consists of 7 horizontal rows-Periods and 18 vertical columns-Groups. Group 1 consists of alkali metals. Group 2 consists of alkaline earth metals. Groups 3 to 12 consists of transition metals. Groups 13 to 16 consist of post transition elements including metalloids.