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The period number in the long form of the periodic table is equal to
(a) magnetic quantum number of any element of the period.
(b) atomic number of any element of the period.
(c) maximum principal quantum number of any element of the period.
(d) maximum Azimuthal quantum number of any element of the period.

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Period number in table equals to maximum principal quantum number.. I.e if any number has electronic configuration in which last electron fill in 3p thn thts number belongs to 3rd period

It is given by maximum principal quantum no of the element in period


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