what is the relation between the period number and principal quantum number
ln Modern periodic table?
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Elements of the same period share the same principal quantum number, which describes both the size and energy of an atom's outermost electron shell.
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The period number and the principal quantum number in the modern periodic table are same.
• A period number represents the number of shells present in the elements belonging to that period.
• Principal quantum number is the quantum number denoting number of shells in an element, and can be determined by the period to which an element belongs.
• For example - Sodium belongs to the third period in the periodic table. Therefore, its principal quantum number is 3, denoting that it has a total of three shells in it.
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