Question

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 quanoum numbers of any element of the period

Answer 1

Answer: (C)

Period number $=$ maximum $n$ of any element
where, $n=$ principal quantum number .