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

(i) magnetic quantum number of any element of the period.

(ii) atomic number of any element of the period.

(iii) maximum Principal quantum number of any element of the period.

(iv) maximum Azimuthal quantum number of any element of the period.

Answers (1)

The answer is the option (iii) maximum principal quantum number of any element of the period.

Explanation: The period indicates the value of n for the outermost or valence shell. Hence, Period Number= maximum n of any element, where n refers to a principal quantum number.

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