Question

define group in periodic table

Answer 1

In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table, but the f-blockcolumns (between groups 2 and 3) are not numbered. The elements in a group have similar physical or chemical characteristics of the outermost electron shells of their atoms (i.e., the same core charge), as most chemical properties are dominated by the orbital location of the outermost electron. There are three systems of group numbering. The modern numbering group 1 to group 18 is recommended by the International Union of Pure and Applied Chemistry (IUPAC). It replaces two older naming schemes that were mutually confusing. Also, groups may be identified by their topmost element or have a specific name. For example, group 16 is variously described as oxygen group and chalcogen.

Answer 2

There are 18 groups
group 1
Alkalie metals
group 2
alkaline earth metals
group 3 to 12
transition elements
group 13
boron family
group 14
carbon family
group 15
nitrogen family ( nicogen ) 9
group 16
oxygen family ( chalcogens )
group 17
halogen family
group 18
noble gas elements