In the modern periodic table, the period indicates the value of: 

(a) Atomic number

(b) Atomic mass 

(c) Principal quantum number 

(d) Azimuthal quantum number. 

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2 Answers

The value of the principal quantum number (n) for the outermost shell or the valence shell indicates a period in the Modern periodic table. 

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Answer is (c) principle quantum number

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