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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.
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B
maximum Principal quantum number of any element of the period.
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C
maximum Azimuthal quantum number of any element of the period.
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D
atomic number of any element of the period.
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Solution

The correct option is B maximum Principal quantum number of any element of the period.
Each row of the periodic table is called a period. All elements which are present in the same period have the same maximum principal quantum number value ( or number of shells).

Same atomic orbitals mean they have the same principal quantum number (n), therefore the period number of long form of the periodic table refers to the maximum principal quantum number of any element of the period

Hence, option (C) is correct.

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