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  4. The period number in the long form of the periodic table is equal to

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Q. The period number in the long form of the periodic table is equal to

Classification of Elements and Periodicity in Properties

Solution:

the principal quantum number is represented by ' $n$ '. It determines the period number of the element. For example: For $Mg$, the maximum principal quantum number is $3$ . thus it belongs to period $3$ of the periodic table.