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.
Periodic means repeats at regular intervals.In the periodic table, elements are arranged in vertical columns. These columns are called groups or families. The groups are as follows: Group:IA: (except for H): alkali metals. The most reactive of all metals Group: IIA: the alkaline earth metals. Very reactive and not found in the free state in nature. Most of these elements give up their 2 outer electrons and form ions.