The periodic table of elements is a table that provides information of elements in a systematic manner.It gives the information about the names and properties of elements.
The periodic table is divided into groups and periods.A group is a vertical column in a periodic table.There are 18 groups.The elements in a group have similar electronic configuration of the outermost shell.Electronic configuration of elements is the arrangement of electrons in the shells of an atom.A period is the horizontal row in the periodic table.Elements in a period have the same number of electron shells.
Elements of the Halogen family which are in group 17 in the periodic table is the most reactive elements whereas group 8A consists of elements which are considered as the least reactive elements.
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