Answer :
Final answer:
In the Periodic Table, vertical columns are titled 'groups', and horizontal rows are known as 'periods'. Both of these classifications are used to highlight shared properties among elements.
Explanation:
In the Periodic table, the vertical columns are known as groups and the horizontal rows are called periods. This pattern is used universally by chemists and researchers to make it easier to refer to specific elements on the table. Every element within a group shares certain properties like electronegativity, ionization energy, etc. Similarly, elements in the same period have the same number of electron shells. For example, all elements in Group 1 are alkali metals and all elements in Period 3 have three electron shells.
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