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Question
The period number in the long form of the periodic table is equal to ______.
Options
magnetic quantum number of any element of the period.
atomic number of any element of the period.
maximum Principal quantum number of any element of the period.
maximum Azimuthal quantum number of any element of the period.
Solution
The period number in the long form of the periodic table is equal to maximum Principal quantum number of any element of the period.
Explanation:
Since each period starts with the filling of electrons in a new principal quantum number, therefore, the period number in the long form of the periodic table refers to the maximum principal quantum number of any element in the period.
Period number = maximum n of any element
(where, n = principal quantum number).
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