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The alkaline earth metals are metallic elements found in group 2 of the periodic table.Group 1 contains alkali metals (Li, Na, K, Rb, Cs and Fr).Periods - In periodic table elements are arranged in a series of rows. Elements of the same period have the same number of electron shells.Each column is called a group. All elements in a group have similar chemical and physical properties because they have the same number of valence electrons. Groups - There are 18 vertical columns in the periodic table.The modern periodic table is based on the modern periodic law. The Modern periodic law states that The chemical and physical properties of elements are a periodic function of their atomic numbers.

Periodic Table: It is the table of chemical elements arranged in order of atomic number such that elements with similar atomic structure appear in the vertical columns.