what is modem periodic law discuss the Mai features of periodic table .
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The vertical columns of the periodic table are called the groups and the elements of the same group share similar properties. The horizontal rows are called the periods. Different periods have different principal quantum numbers for the valence shell. There are 18 groups and 7 periods in the modern periodic table.
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Step-by-step explanation:
The Periodic Table organizes the elements according to their similar chemical and physical properties. The Table has rows and columns.The vertical columns in the periodic table represent Groups. The horizontal rows in table represents Periods.
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