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

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atomic 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

maximum principal quantum number of any element of the period

answer is C.

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Detailed Solution

Since every period begins with the filling of electrons into a new principal quantum number, the period number in the long form of the periodic table denotes the highest principal quantum number of any element during that period.

The periodic number in the long form of the periodic table is equal to maximum principal quantum number of any element of the period.

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