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Question:

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

atomic number of any element of the period

maximum principal quantum number of any element of the period

magnetic quantum number of any element of the period

maximum azimuthal quantum number of any element of the period

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.